32 files changed, 2626 insertions, 2638 deletions
diff --git a/csharp/src/ProtocolBuffers.Test/IssuesTest.cs b/csharp/src/ProtocolBuffers.Test/IssuesTest.cs
index d2248158..b5ad34ae 100644
--- a/csharp/src/ProtocolBuffers.Test/IssuesTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/IssuesTest.cs
@@ -30,7 +30,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
 
-using Google.Protobuf.Descriptors;
+using Google.Protobuf.Reflection;
 using UnitTest.Issues.TestProtos;
 using NUnit.Framework;
 
diff --git a/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj b/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
index 269961c7..45c75bae 100644
--- a/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
+++ b/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
@@ -81,6 +81,7 @@
     <Compile Include="Collections\MapFieldTest.cs" />
     <Compile Include="Collections\RepeatedFieldTest.cs" />
     <Compile Include="JsonFormatterTest.cs" />
+    <Compile Include="Reflection\DescriptorsTest.cs" />
     <Compile Include="SampleEnum.cs" />
     <Compile Include="SampleMessages.cs" />
     <Compile Include="TestProtos\MapUnittestProto3.cs" />
@@ -89,7 +90,6 @@
     <Compile Include="TestProtos\UnittestIssues.cs" />
     <Compile Include="TestProtos\UnittestProto3.cs" />
     <Compile Include="DeprecatedMemberTest.cs" />
-    <Compile Include="DescriptorsTest.cs" />
     <Compile Include="IssuesTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="TestCornerCases.cs" />
diff --git a/csharp/src/ProtocolBuffers.Test/DescriptorsTest.cs b/csharp/src/ProtocolBuffers.Test/Reflection/DescriptorsTest.cs
index d5c622bc..0db01a5e 100644
--- a/csharp/src/ProtocolBuffers.Test/DescriptorsTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/Reflection/DescriptorsTest.cs
@@ -1,225 +1,223 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System.Linq;
-using Google.Protobuf.DescriptorProtos;
-using Google.Protobuf.Descriptors;
-using Google.Protobuf.TestProtos;
-using NUnit.Framework;
-
-namespace Google.Protobuf
-{
-    /// <summary>
-    /// Tests for descriptors. (Not in its own namespace or broken up into individual classes as the
-    /// size doesn't warrant it. On the other hand, this makes me feel a bit dirty...)
-    /// </summary>
-    public class DescriptorsTest
-    {
-        [Test]
-        public void FileDescriptor()
-        {
-            FileDescriptor file = UnittestProto3.Descriptor;
-
-            Assert.AreEqual("google/protobuf/unittest_proto3.proto", file.Name);
-            Assert.AreEqual("protobuf_unittest", file.Package);
-
-            Assert.AreEqual("UnittestProto", file.Proto.Options.JavaOuterClassname);
-            Assert.AreEqual("google/protobuf/unittest_proto3.proto", file.Proto.Name);
-
-            // unittest.proto doesn't have any public imports, but unittest_import.proto does.
-            Assert.AreEqual(0, file.PublicDependencies.Count);
-            Assert.AreEqual(1, UnittestImportProto3.Descriptor.PublicDependencies.Count);
-            Assert.AreEqual(UnittestImportPublicProto3.Descriptor, UnittestImportProto3.Descriptor.PublicDependencies[0]);
-
-            Assert.AreEqual(1, file.Dependencies.Count);
-            Assert.AreEqual(UnittestImportProto3.Descriptor, file.Dependencies[0]);
-
-            MessageDescriptor messageType = TestAllTypes.Descriptor;
-            Assert.AreEqual(messageType, file.MessageTypes[0]);
-            Assert.AreEqual(messageType, file.FindTypeByName<MessageDescriptor>("TestAllTypes"));
-            Assert.Null(file.FindTypeByName<MessageDescriptor>("NoSuchType"));
-            Assert.Null(file.FindTypeByName<MessageDescriptor>("protobuf_unittest.TestAllTypes"));
-            for (int i = 0; i < file.MessageTypes.Count; i++)
-            {
-                Assert.AreEqual(i, file.MessageTypes[i].Index);
-            }
-
-            Assert.AreEqual(file.EnumTypes[0], file.FindTypeByName<EnumDescriptor>("ForeignEnum"));
-            Assert.Null(file.FindTypeByName<EnumDescriptor>("NoSuchType"));
-            Assert.Null(file.FindTypeByName<EnumDescriptor>("protobuf_unittest.ForeignEnum"));
-            Assert.AreEqual(1, UnittestImportProto3.Descriptor.EnumTypes.Count);
-            Assert.AreEqual("ImportEnum", UnittestImportProto3.Descriptor.EnumTypes[0].Name);
-            for (int i = 0; i < file.EnumTypes.Count; i++)
-            {
-                Assert.AreEqual(i, file.EnumTypes[i].Index);
-            }
-        }
-
-        [Test]
-        public void MessageDescriptor()
-        {
-            MessageDescriptor messageType = TestAllTypes.Descriptor;
-            MessageDescriptor nestedType = TestAllTypes.Types.NestedMessage.Descriptor;
-
-            Assert.AreEqual("TestAllTypes", messageType.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes", messageType.FullName);
-            Assert.AreEqual(UnittestProto3.Descriptor, messageType.File);
-            Assert.IsNull(messageType.ContainingType);
-            Assert.IsNull(messageType.Proto.Options);
-
-            Assert.AreEqual("TestAllTypes", messageType.Name);
-
-            Assert.AreEqual("NestedMessage", nestedType.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedMessage", nestedType.FullName);
-            Assert.AreEqual(UnittestProto3.Descriptor, nestedType.File);
-            Assert.AreEqual(messageType, nestedType.ContainingType);
-
-            FieldDescriptor field = messageType.Fields[0];
-            Assert.AreEqual("single_int32", field.Name);
-            Assert.AreEqual(field, messageType.FindDescriptor<FieldDescriptor>("single_int32"));
-            Assert.Null(messageType.FindDescriptor<FieldDescriptor>("no_such_field"));
-            Assert.AreEqual(field, messageType.FindFieldByNumber(1));
-            Assert.Null(messageType.FindFieldByNumber(571283));
-            for (int i = 0; i < messageType.Fields.Count; i++)
-            {
-                Assert.AreEqual(i, messageType.Fields[i].Index);
-            }
-
-            Assert.AreEqual(nestedType, messageType.NestedTypes[0]);
-            Assert.AreEqual(nestedType, messageType.FindDescriptor<MessageDescriptor>("NestedMessage"));
-            Assert.Null(messageType.FindDescriptor<MessageDescriptor>("NoSuchType"));
-            for (int i = 0; i < messageType.NestedTypes.Count; i++)
-            {
-                Assert.AreEqual(i, messageType.NestedTypes[i].Index);
-            }
-
-            Assert.AreEqual(messageType.EnumTypes[0], messageType.FindDescriptor<EnumDescriptor>("NestedEnum"));
-            Assert.Null(messageType.FindDescriptor<EnumDescriptor>("NoSuchType"));
-            for (int i = 0; i < messageType.EnumTypes.Count; i++)
-            {
-                Assert.AreEqual(i, messageType.EnumTypes[i].Index);
-            }
-        }
-
-        [Test]
-        public void FieldDescriptor()
-        {
-            MessageDescriptor messageType = TestAllTypes.Descriptor;
-            FieldDescriptor primitiveField = messageType.FindDescriptor<FieldDescriptor>("single_int32");
-            FieldDescriptor enumField = messageType.FindDescriptor<FieldDescriptor>("single_nested_enum");
-            FieldDescriptor messageField = messageType.FindDescriptor<FieldDescriptor>("single_foreign_message");
-
-            Assert.AreEqual("single_int32", primitiveField.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.single_int32",
-                            primitiveField.FullName);
-            Assert.AreEqual(1, primitiveField.FieldNumber);
-            Assert.AreEqual(messageType, primitiveField.ContainingType);
-            Assert.AreEqual(UnittestProto3.Descriptor, primitiveField.File);
-            Assert.AreEqual(FieldType.Int32, primitiveField.FieldType);
-            Assert.IsNull(primitiveField.Proto.Options);
-            
-            Assert.AreEqual("single_nested_enum", enumField.Name);
-            Assert.AreEqual(FieldType.Enum, enumField.FieldType);
-            // Assert.AreEqual(TestAllTypes.Types.NestedEnum.DescriptorProtoFile, enumField.EnumType);
-
-            Assert.AreEqual("single_foreign_message", messageField.Name);
-            Assert.AreEqual(FieldType.Message, messageField.FieldType);
-            Assert.AreEqual(ForeignMessage.Descriptor, messageField.MessageType);
-        }
-
-        [Test]
-        public void FieldDescriptorLabel()
-        {
-            FieldDescriptor singleField =
-                TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("single_int32");
-            FieldDescriptor repeatedField =
-                TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("repeated_int32");
-
-            Assert.IsFalse(singleField.IsRepeated);
-            Assert.IsTrue(repeatedField.IsRepeated);
-        }
-
-        [Test]
-        public void EnumDescriptor()
-        {
-            // Note: this test is a bit different to the Java version because there's no static way of getting to the descriptor
-            EnumDescriptor enumType = UnittestProto3.Descriptor.FindTypeByName<EnumDescriptor>("ForeignEnum");
-            EnumDescriptor nestedType = TestAllTypes.Descriptor.FindDescriptor<EnumDescriptor>("NestedEnum");
-
-            Assert.AreEqual("ForeignEnum", enumType.Name);
-            Assert.AreEqual("protobuf_unittest.ForeignEnum", enumType.FullName);
-            Assert.AreEqual(UnittestProto3.Descriptor, enumType.File);
-            Assert.Null(enumType.ContainingType);
-            Assert.Null(enumType.Proto.Options);
-
-            Assert.AreEqual("NestedEnum", nestedType.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedEnum",
-                            nestedType.FullName);
-            Assert.AreEqual(UnittestProto3.Descriptor, nestedType.File);
-            Assert.AreEqual(TestAllTypes.Descriptor, nestedType.ContainingType);
-
-            EnumValueDescriptor value = enumType.FindValueByName("FOREIGN_FOO");
-            Assert.AreEqual(value, enumType.Values[1]);
-            Assert.AreEqual("FOREIGN_FOO", value.Name);
-            Assert.AreEqual(4, value.Number);
-            Assert.AreEqual((int) ForeignEnum.FOREIGN_FOO, value.Number);
-            Assert.AreEqual(value, enumType.FindValueByNumber(4));
-            Assert.Null(enumType.FindValueByName("NO_SUCH_VALUE"));
-            for (int i = 0; i < enumType.Values.Count; i++)
-            {
-                Assert.AreEqual(i, enumType.Values[i].Index);
-            }
-        }
-
-        [Test]
-        public void OneofDescriptor()
-        {
-            OneofDescriptor descriptor = TestAllTypes.Descriptor.FindDescriptor<OneofDescriptor>("oneof_field");
-            Assert.AreEqual("oneof_field", descriptor.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.oneof_field", descriptor.FullName);
-
-            var expectedFields = new[] {
-                TestAllTypes.OneofBytesFieldNumber,
-                TestAllTypes.OneofNestedMessageFieldNumber,
-                TestAllTypes.OneofStringFieldNumber,
-                TestAllTypes.OneofUint32FieldNumber }
-                .Select(fieldNumber => TestAllTypes.Descriptor.FindFieldByNumber(fieldNumber))
-                .ToList();
-            foreach (var field in expectedFields)
-            {
-                Assert.AreSame(descriptor, field.ContainingOneof);
-            }
-
-            CollectionAssert.AreEquivalent(expectedFields, descriptor.Fields);
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System.Linq;
+using Google.Protobuf.TestProtos;
+using NUnit.Framework;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Tests for descriptors. (Not in its own namespace or broken up into individual classes as the
+    /// size doesn't warrant it. On the other hand, this makes me feel a bit dirty...)
+    /// </summary>
+    public class DescriptorsTest
+    {
+        [Test]
+        public void FileDescriptor()
+        {
+            FileDescriptor file = UnittestProto3.Descriptor;
+
+            Assert.AreEqual("google/protobuf/unittest_proto3.proto", file.Name);
+            Assert.AreEqual("protobuf_unittest", file.Package);
+
+            Assert.AreEqual("UnittestProto", file.Proto.Options.JavaOuterClassname);
+            Assert.AreEqual("google/protobuf/unittest_proto3.proto", file.Proto.Name);
+
+            // unittest.proto doesn't have any public imports, but unittest_import.proto does.
+            Assert.AreEqual(0, file.PublicDependencies.Count);
+            Assert.AreEqual(1, UnittestImportProto3.Descriptor.PublicDependencies.Count);
+            Assert.AreEqual(UnittestImportPublicProto3.Descriptor, UnittestImportProto3.Descriptor.PublicDependencies[0]);
+
+            Assert.AreEqual(1, file.Dependencies.Count);
+            Assert.AreEqual(UnittestImportProto3.Descriptor, file.Dependencies[0]);
+
+            MessageDescriptor messageType = TestAllTypes.Descriptor;
+            Assert.AreEqual(messageType, file.MessageTypes[0]);
+            Assert.AreEqual(messageType, file.FindTypeByName<MessageDescriptor>("TestAllTypes"));
+            Assert.Null(file.FindTypeByName<MessageDescriptor>("NoSuchType"));
+            Assert.Null(file.FindTypeByName<MessageDescriptor>("protobuf_unittest.TestAllTypes"));
+            for (int i = 0; i < file.MessageTypes.Count; i++)
+            {
+                Assert.AreEqual(i, file.MessageTypes[i].Index);
+            }
+
+            Assert.AreEqual(file.EnumTypes[0], file.FindTypeByName<EnumDescriptor>("ForeignEnum"));
+            Assert.Null(file.FindTypeByName<EnumDescriptor>("NoSuchType"));
+            Assert.Null(file.FindTypeByName<EnumDescriptor>("protobuf_unittest.ForeignEnum"));
+            Assert.AreEqual(1, UnittestImportProto3.Descriptor.EnumTypes.Count);
+            Assert.AreEqual("ImportEnum", UnittestImportProto3.Descriptor.EnumTypes[0].Name);
+            for (int i = 0; i < file.EnumTypes.Count; i++)
+            {
+                Assert.AreEqual(i, file.EnumTypes[i].Index);
+            }
+        }
+
+        [Test]
+        public void MessageDescriptor()
+        {
+            MessageDescriptor messageType = TestAllTypes.Descriptor;
+            MessageDescriptor nestedType = TestAllTypes.Types.NestedMessage.Descriptor;
+
+            Assert.AreEqual("TestAllTypes", messageType.Name);
+            Assert.AreEqual("protobuf_unittest.TestAllTypes", messageType.FullName);
+            Assert.AreEqual(UnittestProto3.Descriptor, messageType.File);
+            Assert.IsNull(messageType.ContainingType);
+            Assert.IsNull(messageType.Proto.Options);
+
+            Assert.AreEqual("TestAllTypes", messageType.Name);
+
+            Assert.AreEqual("NestedMessage", nestedType.Name);
+            Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedMessage", nestedType.FullName);
+            Assert.AreEqual(UnittestProto3.Descriptor, nestedType.File);
+            Assert.AreEqual(messageType, nestedType.ContainingType);
+
+            FieldDescriptor field = messageType.Fields[0];
+            Assert.AreEqual("single_int32", field.Name);
+            Assert.AreEqual(field, messageType.FindDescriptor<FieldDescriptor>("single_int32"));
+            Assert.Null(messageType.FindDescriptor<FieldDescriptor>("no_such_field"));
+            Assert.AreEqual(field, messageType.FindFieldByNumber(1));
+            Assert.Null(messageType.FindFieldByNumber(571283));
+            for (int i = 0; i < messageType.Fields.Count; i++)
+            {
+                Assert.AreEqual(i, messageType.Fields[i].Index);
+            }
+
+            Assert.AreEqual(nestedType, messageType.NestedTypes[0]);
+            Assert.AreEqual(nestedType, messageType.FindDescriptor<MessageDescriptor>("NestedMessage"));
+            Assert.Null(messageType.FindDescriptor<MessageDescriptor>("NoSuchType"));
+            for (int i = 0; i < messageType.NestedTypes.Count; i++)
+            {
+                Assert.AreEqual(i, messageType.NestedTypes[i].Index);
+            }
+
+            Assert.AreEqual(messageType.EnumTypes[0], messageType.FindDescriptor<EnumDescriptor>("NestedEnum"));
+            Assert.Null(messageType.FindDescriptor<EnumDescriptor>("NoSuchType"));
+            for (int i = 0; i < messageType.EnumTypes.Count; i++)
+            {
+                Assert.AreEqual(i, messageType.EnumTypes[i].Index);
+            }
+        }
+
+        [Test]
+        public void FieldDescriptor()
+        {
+            MessageDescriptor messageType = TestAllTypes.Descriptor;
+            FieldDescriptor primitiveField = messageType.FindDescriptor<FieldDescriptor>("single_int32");
+            FieldDescriptor enumField = messageType.FindDescriptor<FieldDescriptor>("single_nested_enum");
+            FieldDescriptor messageField = messageType.FindDescriptor<FieldDescriptor>("single_foreign_message");
+
+            Assert.AreEqual("single_int32", primitiveField.Name);
+            Assert.AreEqual("protobuf_unittest.TestAllTypes.single_int32",
+                            primitiveField.FullName);
+            Assert.AreEqual(1, primitiveField.FieldNumber);
+            Assert.AreEqual(messageType, primitiveField.ContainingType);
+            Assert.AreEqual(UnittestProto3.Descriptor, primitiveField.File);
+            Assert.AreEqual(FieldType.Int32, primitiveField.FieldType);
+            Assert.IsNull(primitiveField.Proto.Options);
+            
+            Assert.AreEqual("single_nested_enum", enumField.Name);
+            Assert.AreEqual(FieldType.Enum, enumField.FieldType);
+            // Assert.AreEqual(TestAllTypes.Types.NestedEnum.DescriptorProtoFile, enumField.EnumType);
+
+            Assert.AreEqual("single_foreign_message", messageField.Name);
+            Assert.AreEqual(FieldType.Message, messageField.FieldType);
+            Assert.AreEqual(ForeignMessage.Descriptor, messageField.MessageType);
+        }
+
+        [Test]
+        public void FieldDescriptorLabel()
+        {
+            FieldDescriptor singleField =
+                TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("single_int32");
+            FieldDescriptor repeatedField =
+                TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("repeated_int32");
+
+            Assert.IsFalse(singleField.IsRepeated);
+            Assert.IsTrue(repeatedField.IsRepeated);
+        }
+
+        [Test]
+        public void EnumDescriptor()
+        {
+            // Note: this test is a bit different to the Java version because there's no static way of getting to the descriptor
+            EnumDescriptor enumType = UnittestProto3.Descriptor.FindTypeByName<EnumDescriptor>("ForeignEnum");
+            EnumDescriptor nestedType = TestAllTypes.Descriptor.FindDescriptor<EnumDescriptor>("NestedEnum");
+
+            Assert.AreEqual("ForeignEnum", enumType.Name);
+            Assert.AreEqual("protobuf_unittest.ForeignEnum", enumType.FullName);
+            Assert.AreEqual(UnittestProto3.Descriptor, enumType.File);
+            Assert.Null(enumType.ContainingType);
+            Assert.Null(enumType.Proto.Options);
+
+            Assert.AreEqual("NestedEnum", nestedType.Name);
+            Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedEnum",
+                            nestedType.FullName);
+            Assert.AreEqual(UnittestProto3.Descriptor, nestedType.File);
+            Assert.AreEqual(TestAllTypes.Descriptor, nestedType.ContainingType);
+
+            EnumValueDescriptor value = enumType.FindValueByName("FOREIGN_FOO");
+            Assert.AreEqual(value, enumType.Values[1]);
+            Assert.AreEqual("FOREIGN_FOO", value.Name);
+            Assert.AreEqual(4, value.Number);
+            Assert.AreEqual((int) ForeignEnum.FOREIGN_FOO, value.Number);
+            Assert.AreEqual(value, enumType.FindValueByNumber(4));
+            Assert.Null(enumType.FindValueByName("NO_SUCH_VALUE"));
+            for (int i = 0; i < enumType.Values.Count; i++)
+            {
+                Assert.AreEqual(i, enumType.Values[i].Index);
+            }
+        }
+
+        [Test]
+        public void OneofDescriptor()
+        {
+            OneofDescriptor descriptor = TestAllTypes.Descriptor.FindDescriptor<OneofDescriptor>("oneof_field");
+            Assert.AreEqual("oneof_field", descriptor.Name);
+            Assert.AreEqual("protobuf_unittest.TestAllTypes.oneof_field", descriptor.FullName);
+
+            var expectedFields = new[] {
+                TestAllTypes.OneofBytesFieldNumber,
+                TestAllTypes.OneofNestedMessageFieldNumber,
+                TestAllTypes.OneofStringFieldNumber,
+                TestAllTypes.OneofUint32FieldNumber }
+                .Select(fieldNumber => TestAllTypes.Descriptor.FindFieldByNumber(fieldNumber))
+                .ToList();
+            foreach (var field in expectedFields)
+            {
+                Assert.AreSame(descriptor, field.ContainingOneof);
+            }
+
+            CollectionAssert.AreEquivalent(expectedFields, descriptor.Fields);
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/IMessage.cs b/csharp/src/ProtocolBuffers/IMessage.cs
index 3324e9ae..8c4a4aaf 100644
--- a/csharp/src/ProtocolBuffers/IMessage.cs
+++ b/csharp/src/ProtocolBuffers/IMessage.cs
@@ -31,7 +31,7 @@
 #endregion
 
 using System;
-using Google.Protobuf.FieldAccess;
+using Google.Protobuf.Reflection;
 
 namespace Google.Protobuf
 {
diff --git a/csharp/src/ProtocolBuffers/JsonFormatter.cs b/csharp/src/ProtocolBuffers/JsonFormatter.cs
index 9bd628eb..dacc7221 100644
--- a/csharp/src/ProtocolBuffers/JsonFormatter.cs
+++ b/csharp/src/ProtocolBuffers/JsonFormatter.cs
@@ -34,8 +34,7 @@ using System;
 using System.Collections;
 using System.Globalization;
 using System.Text;
-using Google.Protobuf.Descriptors;
-using Google.Protobuf.FieldAccess;
+using Google.Protobuf.Reflection;
 
 namespace Google.Protobuf
 {
diff --git a/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj b/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
index f5dd6d5a..8f1d87ab 100644
--- a/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
+++ b/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
@@ -62,45 +62,46 @@
     <Compile Include="Collections\RepeatedField.cs" />
     <Compile Include="DescriptorProtos\DescriptorProtoFile.cs" />
     <Compile Include="DescriptorProtos\PartialClasses.cs" />
-    <Compile Include="Descriptors\DescriptorBase.cs" />
-    <Compile Include="Descriptors\DescriptorPool.cs" />
-    <Compile Include="Descriptors\DescriptorUtil.cs" />
-    <Compile Include="Descriptors\DescriptorValidationException.cs" />
-    <Compile Include="Descriptors\EnumDescriptor.cs" />
-    <Compile Include="Descriptors\EnumValueDescriptor.cs" />
-    <Compile Include="Descriptors\FieldDescriptor.cs" />
-    <Compile Include="Descriptors\FieldType.cs" />
-    <Compile Include="Descriptors\FileDescriptor.cs" />
-    <Compile Include="Descriptors\OneofDescriptor.cs" />
-    <Compile Include="Descriptors\IDescriptor.cs" />
-    <Compile Include="Descriptors\MessageDescriptor.cs" />
-    <Compile Include="Descriptors\MethodDescriptor.cs" />
-    <Compile Include="Descriptors\PackageDescriptor.cs" />
-    <Compile Include="Descriptors\ServiceDescriptor.cs" />
-    <Compile Include="FieldAccess\MapFieldAccessor.cs" />
     <Compile Include="FieldCodec.cs" />
     <Compile Include="FrameworkPortability.cs" />
     <Compile Include="Freezable.cs" />
     <Compile Include="JsonFormatter.cs" />
     <Compile Include="MessageExtensions.cs" />
-    <Compile Include="FieldAccess\FieldAccessorBase.cs" />
-    <Compile Include="FieldAccess\ReflectionUtil.cs" />
-    <Compile Include="FieldAccess\RepeatedFieldAccessor.cs" />
-    <Compile Include="FieldAccess\SingleFieldAccessor.cs" />
-    <Compile Include="FieldAccess\IFieldAccessor.cs" />
-    <Compile Include="FieldAccess\FieldAccessorTable.cs" />
-    <Compile Include="FieldAccess\OneofAccessor.cs" />
     <Compile Include="IMessage.cs" />
     <Compile Include="InvalidProtocolBufferException.cs" />
     <Compile Include="LimitedInputStream.cs" />
     <Compile Include="MessageParser.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Reflection\DescriptorBase.cs" />
+    <Compile Include="Reflection\DescriptorPool.cs" />
+    <Compile Include="Reflection\DescriptorUtil.cs" />
+    <Compile Include="Reflection\DescriptorValidationException.cs" />
+    <Compile Include="Reflection\EnumDescriptor.cs" />
+    <Compile Include="Reflection\EnumValueDescriptor.cs" />
+    <Compile Include="Reflection\FieldAccessorBase.cs" />
+    <Compile Include="Reflection\FieldAccessorTable.cs" />
+    <Compile Include="Reflection\FieldDescriptor.cs" />
+    <Compile Include="Reflection\FieldType.cs" />
+    <Compile Include="Reflection\FileDescriptor.cs" />
+    <Compile Include="Reflection\IDescriptor.cs" />
+    <Compile Include="Reflection\IFieldAccessor.cs" />
+    <Compile Include="Reflection\MapFieldAccessor.cs" />
+    <Compile Include="Reflection\MessageDescriptor.cs" />
+    <Compile Include="Reflection\MethodDescriptor.cs" />
+    <Compile Include="Reflection\OneofAccessor.cs" />
+    <Compile Include="Reflection\OneofDescriptor.cs" />
+    <Compile Include="Reflection\PackageDescriptor.cs" />
+    <Compile Include="Reflection\ReflectionUtil.cs" />
+    <Compile Include="Reflection\RepeatedFieldAccessor.cs" />
+    <Compile Include="Reflection\ServiceDescriptor.cs" />
+    <Compile Include="Reflection\SingleFieldAccessor.cs" />
     <Compile Include="ThrowHelper.cs" />
     <Compile Include="WireFormat.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Google.Protobuf.nuspec" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/csharp/src/ProtocolBuffers/Descriptors/DescriptorBase.cs b/csharp/src/ProtocolBuffers/Reflection/DescriptorBase.cs
index 0eb71215..0300cd58 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/DescriptorBase.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/DescriptorBase.cs
@@ -1,84 +1,82 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Base class for nearly all descriptors, providing common functionality.
-    /// </summary>
-    public abstract class DescriptorBase : IDescriptor
-    {
-        private readonly FileDescriptor file;
-        private readonly string fullName;
-        private readonly int index;
-
-        internal DescriptorBase(FileDescriptor file, string fullName, int index)
-        {
-            this.file = file;
-            this.fullName = fullName;
-            this.index = index;
-        }
-
-        /// <value>
-        /// The index of this descriptor within its parent descriptor. 
-        /// </value>
-        /// <remarks>
-        /// This returns the index of this descriptor within its parent, for
-        /// this descriptor's type. (There can be duplicate values for different
-        /// types, e.g. one enum type with index 0 and one message type with index 0.)
-        /// </remarks>
-        public int Index
-        {
-            get { return index; }
-        }
-
-        public abstract string Name { get; }
-
-        /// <summary>
-        /// The fully qualified name of the descriptor's target.
-        /// </summary>
-        public string FullName
-        {
-            get { return fullName; }
-        }
-
-        /// <value>
-        /// The file this descriptor was declared in.
-        /// </value>
-        public FileDescriptor File
-        {
-            get { return file; }
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Base class for nearly all descriptors, providing common functionality.
+    /// </summary>
+    public abstract class DescriptorBase : IDescriptor
+    {
+        private readonly FileDescriptor file;
+        private readonly string fullName;
+        private readonly int index;
+
+        internal DescriptorBase(FileDescriptor file, string fullName, int index)
+        {
+            this.file = file;
+            this.fullName = fullName;
+            this.index = index;
+        }
+
+        /// <value>
+        /// The index of this descriptor within its parent descriptor. 
+        /// </value>
+        /// <remarks>
+        /// This returns the index of this descriptor within its parent, for
+        /// this descriptor's type. (There can be duplicate values for different
+        /// types, e.g. one enum type with index 0 and one message type with index 0.)
+        /// </remarks>
+        public int Index
+        {
+            get { return index; }
+        }
+
+        public abstract string Name { get; }
+
+        /// <summary>
+        /// The fully qualified name of the descriptor's target.
+        /// </summary>
+        public string FullName
+        {
+            get { return fullName; }
+        }
+
+        /// <value>
+        /// The file this descriptor was declared in.
+        /// </value>
+        public FileDescriptor File
+        {
+            get { return file; }
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/DescriptorPool.cs b/csharp/src/ProtocolBuffers/Reflection/DescriptorPool.cs
index b07af060..157ea400 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/DescriptorPool.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/DescriptorPool.cs
@@ -1,365 +1,365 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Collections.Generic;
-using System.Text;
-using System.Text.RegularExpressions;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Contains lookup tables containing all the descriptors defined in a particular file.
-    /// </summary>
-    internal sealed class DescriptorPool
-    {
-        private readonly IDictionary<string, IDescriptor> descriptorsByName =
-            new Dictionary<string, IDescriptor>();
-
-        private readonly IDictionary<DescriptorIntPair, FieldDescriptor> fieldsByNumber =
-            new Dictionary<DescriptorIntPair, FieldDescriptor>();
-
-        private readonly IDictionary<DescriptorIntPair, EnumValueDescriptor> enumValuesByNumber =
-            new Dictionary<DescriptorIntPair, EnumValueDescriptor>();
-
-        private readonly HashSet<FileDescriptor> dependencies;
-
-        internal DescriptorPool(FileDescriptor[] dependencyFiles)
-        {
-            dependencies = new HashSet<FileDescriptor>();
-            for (int i = 0; i < dependencyFiles.Length; i++)
-            {
-                dependencies.Add(dependencyFiles[i]);
-                ImportPublicDependencies(dependencyFiles[i]);
-            }
-
-            foreach (FileDescriptor dependency in dependencyFiles)
-            {
-                AddPackage(dependency.Package, dependency);
-            }
-        }
-
-        private void ImportPublicDependencies(FileDescriptor file)
-        {
-            foreach (FileDescriptor dependency in file.PublicDependencies)
-            {
-                if (dependencies.Add(dependency))
-                {
-                    ImportPublicDependencies(dependency);
-                }
-            }
-        }
-
-        /// <summary>
-        /// Finds a symbol of the given name within the pool.
-        /// </summary>
-        /// <typeparam name="T">The type of symbol to look for</typeparam>
-        /// <param name="fullName">Fully-qualified name to look up</param>
-        /// <returns>The symbol with the given name and type,
-        /// or null if the symbol doesn't exist or has the wrong type</returns>
-        internal T FindSymbol<T>(string fullName) where T : class
-        {
-            IDescriptor result;
-            descriptorsByName.TryGetValue(fullName, out result);
-            T descriptor = result as T;
-            if (descriptor != null)
-            {
-                return descriptor;
-            }
-
-            foreach (FileDescriptor dependency in dependencies)
-            {
-                dependency.DescriptorPool.descriptorsByName.TryGetValue(fullName, out result);
-                descriptor = result as T;
-                if (descriptor != null)
-                {
-                    return descriptor;
-                }
-            }
-
-            return null;
-        }
-
-        /// <summary>
-        /// Adds a package to the symbol tables. If a package by the same name
-        /// already exists, that is fine, but if some other kind of symbol
-        /// exists under the same name, an exception is thrown. If the package
-        /// has multiple components, this also adds the parent package(s).
-        /// </summary>
-        internal void AddPackage(string fullName, FileDescriptor file)
-        {
-            int dotpos = fullName.LastIndexOf('.');
-            String name;
-            if (dotpos != -1)
-            {
-                AddPackage(fullName.Substring(0, dotpos), file);
-                name = fullName.Substring(dotpos + 1);
-            }
-            else
-            {
-                name = fullName;
-            }
-
-            IDescriptor old;
-            if (descriptorsByName.TryGetValue(fullName, out old))
-            {
-                if (!(old is PackageDescriptor))
-                {
-                    throw new DescriptorValidationException(file,
-                                                            "\"" + name +
-                                                            "\" is already defined (as something other than a " +
-                                                            "package) in file \"" + old.File.Name + "\".");
-                }
-            }
-            descriptorsByName[fullName] = new PackageDescriptor(name, fullName, file);
-        }
-
-        /// <summary>
-        /// Adds a symbol to the symbol table.
-        /// </summary>
-        /// <exception cref="DescriptorValidationException">The symbol already existed
-        /// in the symbol table.</exception>
-        internal void AddSymbol(IDescriptor descriptor)
-        {
-            ValidateSymbolName(descriptor);
-            String fullName = descriptor.FullName;
-
-            IDescriptor old;
-            if (descriptorsByName.TryGetValue(fullName, out old))
-            {
-                int dotPos = fullName.LastIndexOf('.');
-                string message;
-                if (descriptor.File == old.File)
-                {
-                    if (dotPos == -1)
-                    {
-                        message = "\"" + fullName + "\" is already defined.";
-                    }
-                    else
-                    {
-                        message = "\"" + fullName.Substring(dotPos + 1) + "\" is already defined in \"" +
-                                  fullName.Substring(0, dotPos) + "\".";
-                    }
-                }
-                else
-                {
-                    message = "\"" + fullName + "\" is already defined in file \"" + old.File.Name + "\".";
-                }
-                throw new DescriptorValidationException(descriptor, message);
-            }
-            descriptorsByName[fullName] = descriptor;
-        }
-
-        private static readonly Regex ValidationRegex = new Regex("^[_A-Za-z][_A-Za-z0-9]*$",
-                                                                  FrameworkPortability.CompiledRegexWhereAvailable);
-
-        /// <summary>
-        /// Verifies that the descriptor's name is valid (i.e. it contains
-        /// only letters, digits and underscores, and does not start with a digit).
-        /// </summary>
-        /// <param name="descriptor"></param>
-        private static void ValidateSymbolName(IDescriptor descriptor)
-        {
-            if (descriptor.Name == "")
-            {
-                throw new DescriptorValidationException(descriptor, "Missing name.");
-            }
-            if (!ValidationRegex.IsMatch(descriptor.Name))
-            {
-                throw new DescriptorValidationException(descriptor,
-                                                        "\"" + descriptor.Name + "\" is not a valid identifier.");
-            }
-        }
-
-        /// <summary>
-        /// Returns the field with the given number in the given descriptor,
-        /// or null if it can't be found.
-        /// </summary>
-        internal FieldDescriptor FindFieldByNumber(MessageDescriptor messageDescriptor, int number)
-        {
-            FieldDescriptor ret;
-            fieldsByNumber.TryGetValue(new DescriptorIntPair(messageDescriptor, number), out ret);
-            return ret;
-        }
-
-        internal EnumValueDescriptor FindEnumValueByNumber(EnumDescriptor enumDescriptor, int number)
-        {
-            EnumValueDescriptor ret;
-            enumValuesByNumber.TryGetValue(new DescriptorIntPair(enumDescriptor, number), out ret);
-            return ret;
-        }
-
-        /// <summary>
-        /// Adds a field to the fieldsByNumber table.
-        /// </summary>
-        /// <exception cref="DescriptorValidationException">A field with the same
-        /// containing type and number already exists.</exception>
-        internal void AddFieldByNumber(FieldDescriptor field)
-        {
-            DescriptorIntPair key = new DescriptorIntPair(field.ContainingType, field.FieldNumber);
-            FieldDescriptor old;
-            if (fieldsByNumber.TryGetValue(key, out old))
-            {
-                throw new DescriptorValidationException(field, "Field number " + field.FieldNumber +
-                                                               "has already been used in \"" +
-                                                               field.ContainingType.FullName +
-                                                               "\" by field \"" + old.Name + "\".");
-            }
-            fieldsByNumber[key] = field;
-        }
-
-        /// <summary>
-        /// Adds an enum value to the enumValuesByNumber table. If an enum value
-        /// with the same type and number already exists, this method does nothing.
-        /// (This is allowed; the first value defined with the number takes precedence.)
-        /// </summary>
-        internal void AddEnumValueByNumber(EnumValueDescriptor enumValue)
-        {
-            DescriptorIntPair key = new DescriptorIntPair(enumValue.EnumDescriptor, enumValue.Number);
-            if (!enumValuesByNumber.ContainsKey(key))
-            {
-                enumValuesByNumber[key] = enumValue;
-            }
-        }
-
-        /// <summary>
-        /// Looks up a descriptor by name, relative to some other descriptor.
-        /// The name may be fully-qualified (with a leading '.'), partially-qualified,
-        /// or unqualified. C++-like name lookup semantics are used to search for the
-        /// matching descriptor.
-        /// </summary>
-        internal IDescriptor LookupSymbol(string name, IDescriptor relativeTo)
-        {
-            // TODO(jonskeet):  This could be optimized in a number of ways.
-
-            IDescriptor result;
-            if (name.StartsWith("."))
-            {
-                // Fully-qualified name.
-                result = FindSymbol<IDescriptor>(name.Substring(1));
-            }
-            else
-            {
-                // If "name" is a compound identifier, we want to search for the
-                // first component of it, then search within it for the rest.
-                int firstPartLength = name.IndexOf('.');
-                string firstPart = firstPartLength == -1 ? name : name.Substring(0, firstPartLength);
-
-                // We will search each parent scope of "relativeTo" looking for the
-                // symbol.
-                StringBuilder scopeToTry = new StringBuilder(relativeTo.FullName);
-
-                while (true)
-                {
-                    // Chop off the last component of the scope.
-
-                    // TODO(jonskeet): Make this more efficient. May not be worth using StringBuilder at all
-                    int dotpos = scopeToTry.ToString().LastIndexOf(".");
-                    if (dotpos == -1)
-                    {
-                        result = FindSymbol<IDescriptor>(name);
-                        break;
-                    }
-                    else
-                    {
-                        scopeToTry.Length = dotpos + 1;
-
-                        // Append firstPart and try to find.
-                        scopeToTry.Append(firstPart);
-                        result = FindSymbol<IDescriptor>(scopeToTry.ToString());
-
-                        if (result != null)
-                        {
-                            if (firstPartLength != -1)
-                            {
-                                // We only found the first part of the symbol.  Now look for
-                                // the whole thing.  If this fails, we *don't* want to keep
-                                // searching parent scopes.
-                                scopeToTry.Length = dotpos + 1;
-                                scopeToTry.Append(name);
-                                result = FindSymbol<IDescriptor>(scopeToTry.ToString());
-                            }
-                            break;
-                        }
-
-                        // Not found.  Remove the name so we can try again.
-                        scopeToTry.Length = dotpos;
-                    }
-                }
-            }
-
-            if (result == null)
-            {
-                throw new DescriptorValidationException(relativeTo, "\"" + name + "\" is not defined.");
-            }
-            else
-            {
-                return result;
-            }
-        }
-
-        /// <summary>
-        /// Struct used to hold the keys for the fieldByNumber table.
-        /// </summary>
-        private struct DescriptorIntPair : IEquatable<DescriptorIntPair>
-        {
-            private readonly int number;
-            private readonly IDescriptor descriptor;
-
-            internal DescriptorIntPair(IDescriptor descriptor, int number)
-            {
-                this.number = number;
-                this.descriptor = descriptor;
-            }
-
-            public bool Equals(DescriptorIntPair other)
-            {
-                return descriptor == other.descriptor
-                       && number == other.number;
-            }
-
-            public override bool Equals(object obj)
-            {
-                if (obj is DescriptorIntPair)
-                {
-                    return Equals((DescriptorIntPair) obj);
-                }
-                return false;
-            }
-
-            public override int GetHashCode()
-            {
-                return descriptor.GetHashCode()*((1 << 16) - 1) + number;
-            }
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Contains lookup tables containing all the descriptors defined in a particular file.
+    /// </summary>
+    internal sealed class DescriptorPool
+    {
+        private readonly IDictionary<string, IDescriptor> descriptorsByName =
+            new Dictionary<string, IDescriptor>();
+
+        private readonly IDictionary<DescriptorIntPair, FieldDescriptor> fieldsByNumber =
+            new Dictionary<DescriptorIntPair, FieldDescriptor>();
+
+        private readonly IDictionary<DescriptorIntPair, EnumValueDescriptor> enumValuesByNumber =
+            new Dictionary<DescriptorIntPair, EnumValueDescriptor>();
+
+        private readonly HashSet<FileDescriptor> dependencies;
+
+        internal DescriptorPool(FileDescriptor[] dependencyFiles)
+        {
+            dependencies = new HashSet<FileDescriptor>();
+            for (int i = 0; i < dependencyFiles.Length; i++)
+            {
+                dependencies.Add(dependencyFiles[i]);
+                ImportPublicDependencies(dependencyFiles[i]);
+            }
+
+            foreach (FileDescriptor dependency in dependencyFiles)
+            {
+                AddPackage(dependency.Package, dependency);
+            }
+        }
+
+        private void ImportPublicDependencies(FileDescriptor file)
+        {
+            foreach (FileDescriptor dependency in file.PublicDependencies)
+            {
+                if (dependencies.Add(dependency))
+                {
+                    ImportPublicDependencies(dependency);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Finds a symbol of the given name within the pool.
+        /// </summary>
+        /// <typeparam name="T">The type of symbol to look for</typeparam>
+        /// <param name="fullName">Fully-qualified name to look up</param>
+        /// <returns>The symbol with the given name and type,
+        /// or null if the symbol doesn't exist or has the wrong type</returns>
+        internal T FindSymbol<T>(string fullName) where T : class
+        {
+            IDescriptor result;
+            descriptorsByName.TryGetValue(fullName, out result);
+            T descriptor = result as T;
+            if (descriptor != null)
+            {
+                return descriptor;
+            }
+
+            foreach (FileDescriptor dependency in dependencies)
+            {
+                dependency.DescriptorPool.descriptorsByName.TryGetValue(fullName, out result);
+                descriptor = result as T;
+                if (descriptor != null)
+                {
+                    return descriptor;
+                }
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Adds a package to the symbol tables. If a package by the same name
+        /// already exists, that is fine, but if some other kind of symbol
+        /// exists under the same name, an exception is thrown. If the package
+        /// has multiple components, this also adds the parent package(s).
+        /// </summary>
+        internal void AddPackage(string fullName, FileDescriptor file)
+        {
+            int dotpos = fullName.LastIndexOf('.');
+            String name;
+            if (dotpos != -1)
+            {
+                AddPackage(fullName.Substring(0, dotpos), file);
+                name = fullName.Substring(dotpos + 1);
+            }
+            else
+            {
+                name = fullName;
+            }
+
+            IDescriptor old;
+            if (descriptorsByName.TryGetValue(fullName, out old))
+            {
+                if (!(old is PackageDescriptor))
+                {
+                    throw new DescriptorValidationException(file,
+                                                            "\"" + name +
+                                                            "\" is already defined (as something other than a " +
+                                                            "package) in file \"" + old.File.Name + "\".");
+                }
+            }
+            descriptorsByName[fullName] = new PackageDescriptor(name, fullName, file);
+        }
+
+        /// <summary>
+        /// Adds a symbol to the symbol table.
+        /// </summary>
+        /// <exception cref="DescriptorValidationException">The symbol already existed
+        /// in the symbol table.</exception>
+        internal void AddSymbol(IDescriptor descriptor)
+        {
+            ValidateSymbolName(descriptor);
+            String fullName = descriptor.FullName;
+
+            IDescriptor old;
+            if (descriptorsByName.TryGetValue(fullName, out old))
+            {
+                int dotPos = fullName.LastIndexOf('.');
+                string message;
+                if (descriptor.File == old.File)
+                {
+                    if (dotPos == -1)
+                    {
+                        message = "\"" + fullName + "\" is already defined.";
+                    }
+                    else
+                    {
+                        message = "\"" + fullName.Substring(dotPos + 1) + "\" is already defined in \"" +
+                                  fullName.Substring(0, dotPos) + "\".";
+                    }
+                }
+                else
+                {
+                    message = "\"" + fullName + "\" is already defined in file \"" + old.File.Name + "\".";
+                }
+                throw new DescriptorValidationException(descriptor, message);
+            }
+            descriptorsByName[fullName] = descriptor;
+        }
+
+        private static readonly Regex ValidationRegex = new Regex("^[_A-Za-z][_A-Za-z0-9]*$",
+                                                                  FrameworkPortability.CompiledRegexWhereAvailable);
+
+        /// <summary>
+        /// Verifies that the descriptor's name is valid (i.e. it contains
+        /// only letters, digits and underscores, and does not start with a digit).
+        /// </summary>
+        /// <param name="descriptor"></param>
+        private static void ValidateSymbolName(IDescriptor descriptor)
+        {
+            if (descriptor.Name == "")
+            {
+                throw new DescriptorValidationException(descriptor, "Missing name.");
+            }
+            if (!ValidationRegex.IsMatch(descriptor.Name))
+            {
+                throw new DescriptorValidationException(descriptor,
+                                                        "\"" + descriptor.Name + "\" is not a valid identifier.");
+            }
+        }
+
+        /// <summary>
+        /// Returns the field with the given number in the given descriptor,
+        /// or null if it can't be found.
+        /// </summary>
+        internal FieldDescriptor FindFieldByNumber(MessageDescriptor messageDescriptor, int number)
+        {
+            FieldDescriptor ret;
+            fieldsByNumber.TryGetValue(new DescriptorIntPair(messageDescriptor, number), out ret);
+            return ret;
+        }
+
+        internal EnumValueDescriptor FindEnumValueByNumber(EnumDescriptor enumDescriptor, int number)
+        {
+            EnumValueDescriptor ret;
+            enumValuesByNumber.TryGetValue(new DescriptorIntPair(enumDescriptor, number), out ret);
+            return ret;
+        }
+
+        /// <summary>
+        /// Adds a field to the fieldsByNumber table.
+        /// </summary>
+        /// <exception cref="DescriptorValidationException">A field with the same
+        /// containing type and number already exists.</exception>
+        internal void AddFieldByNumber(FieldDescriptor field)
+        {
+            DescriptorIntPair key = new DescriptorIntPair(field.ContainingType, field.FieldNumber);
+            FieldDescriptor old;
+            if (fieldsByNumber.TryGetValue(key, out old))
+            {
+                throw new DescriptorValidationException(field, "Field number " + field.FieldNumber +
+                                                               "has already been used in \"" +
+                                                               field.ContainingType.FullName +
+                                                               "\" by field \"" + old.Name + "\".");
+            }
+            fieldsByNumber[key] = field;
+        }
+
+        /// <summary>
+        /// Adds an enum value to the enumValuesByNumber table. If an enum value
+        /// with the same type and number already exists, this method does nothing.
+        /// (This is allowed; the first value defined with the number takes precedence.)
+        /// </summary>
+        internal void AddEnumValueByNumber(EnumValueDescriptor enumValue)
+        {
+            DescriptorIntPair key = new DescriptorIntPair(enumValue.EnumDescriptor, enumValue.Number);
+            if (!enumValuesByNumber.ContainsKey(key))
+            {
+                enumValuesByNumber[key] = enumValue;
+            }
+        }
+
+        /// <summary>
+        /// Looks up a descriptor by name, relative to some other descriptor.
+        /// The name may be fully-qualified (with a leading '.'), partially-qualified,
+        /// or unqualified. C++-like name lookup semantics are used to search for the
+        /// matching descriptor.
+        /// </summary>
+        internal IDescriptor LookupSymbol(string name, IDescriptor relativeTo)
+        {
+            // TODO(jonskeet):  This could be optimized in a number of ways.
+
+            IDescriptor result;
+            if (name.StartsWith("."))
+            {
+                // Fully-qualified name.
+                result = FindSymbol<IDescriptor>(name.Substring(1));
+            }
+            else
+            {
+                // If "name" is a compound identifier, we want to search for the
+                // first component of it, then search within it for the rest.
+                int firstPartLength = name.IndexOf('.');
+                string firstPart = firstPartLength == -1 ? name : name.Substring(0, firstPartLength);
+
+                // We will search each parent scope of "relativeTo" looking for the
+                // symbol.
+                StringBuilder scopeToTry = new StringBuilder(relativeTo.FullName);
+
+                while (true)
+                {
+                    // Chop off the last component of the scope.
+
+                    // TODO(jonskeet): Make this more efficient. May not be worth using StringBuilder at all
+                    int dotpos = scopeToTry.ToString().LastIndexOf(".");
+                    if (dotpos == -1)
+                    {
+                        result = FindSymbol<IDescriptor>(name);
+                        break;
+                    }
+                    else
+                    {
+                        scopeToTry.Length = dotpos + 1;
+
+                        // Append firstPart and try to find.
+                        scopeToTry.Append(firstPart);
+                        result = FindSymbol<IDescriptor>(scopeToTry.ToString());
+
+                        if (result != null)
+                        {
+                            if (firstPartLength != -1)
+                            {
+                                // We only found the first part of the symbol.  Now look for
+                                // the whole thing.  If this fails, we *don't* want to keep
+                                // searching parent scopes.
+                                scopeToTry.Length = dotpos + 1;
+                                scopeToTry.Append(name);
+                                result = FindSymbol<IDescriptor>(scopeToTry.ToString());
+                            }
+                            break;
+                        }
+
+                        // Not found.  Remove the name so we can try again.
+                        scopeToTry.Length = dotpos;
+                    }
+                }
+            }
+
+            if (result == null)
+            {
+                throw new DescriptorValidationException(relativeTo, "\"" + name + "\" is not defined.");
+            }
+            else
+            {
+                return result;
+            }
+        }
+
+        /// <summary>
+        /// Struct used to hold the keys for the fieldByNumber table.
+        /// </summary>
+        private struct DescriptorIntPair : IEquatable<DescriptorIntPair>
+        {
+            private readonly int number;
+            private readonly IDescriptor descriptor;
+
+            internal DescriptorIntPair(IDescriptor descriptor, int number)
+            {
+                this.number = number;
+                this.descriptor = descriptor;
+            }
+
+            public bool Equals(DescriptorIntPair other)
+            {
+                return descriptor == other.descriptor
+                       && number == other.number;
+            }
+
+            public override bool Equals(object obj)
+            {
+                if (obj is DescriptorIntPair)
+                {
+                    return Equals((DescriptorIntPair) obj);
+                }
+                return false;
+            }
+
+            public override int GetHashCode()
+            {
+                return descriptor.GetHashCode()*((1 << 16) - 1) + number;
+            }
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/DescriptorUtil.cs b/csharp/src/ProtocolBuffers/Reflection/DescriptorUtil.cs
index eb4ced60..af31dfb1 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/DescriptorUtil.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/DescriptorUtil.cs
@@ -1,65 +1,65 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Internal class containing utility methods when working with descriptors.
-    /// </summary>
-    internal static class DescriptorUtil
-    {
-        /// <summary>
-        /// Equivalent to Func[TInput, int, TOutput] but usable in .NET 2.0. Only used to convert
-        /// arrays.
-        /// </summary>
-        internal delegate TOutput IndexedConverter<TInput, TOutput>(TInput element, int index);
-
-        /// <summary>
-        /// Converts the given array into a read-only list, applying the specified conversion to
-        /// each input element.
-        /// </summary>
-        internal static IList<TOutput> ConvertAndMakeReadOnly<TInput, TOutput>(IList<TInput> input,
-                                                                               IndexedConverter<TInput, TOutput>
-                                                                                   converter)
-        {
-            TOutput[] array = new TOutput[input.Count];
-            for (int i = 0; i < array.Length; i++)
-            {
-                array[i] = converter(input[i], i);
-            }
-            return new ReadOnlyCollection<TOutput>(array);
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Internal class containing utility methods when working with descriptors.
+    /// </summary>
+    internal static class DescriptorUtil
+    {
+        /// <summary>
+        /// Equivalent to Func[TInput, int, TOutput] but usable in .NET 2.0. Only used to convert
+        /// arrays.
+        /// </summary>
+        internal delegate TOutput IndexedConverter<TInput, TOutput>(TInput element, int index);
+
+        /// <summary>
+        /// Converts the given array into a read-only list, applying the specified conversion to
+        /// each input element.
+        /// </summary>
+        internal static IList<TOutput> ConvertAndMakeReadOnly<TInput, TOutput>(IList<TInput> input,
+                                                                               IndexedConverter<TInput, TOutput>
+                                                                                   converter)
+        {
+            TOutput[] array = new TOutput[input.Count];
+            for (int i = 0; i < array.Length; i++)
+            {
+                array[i] = converter(input[i], i);
+            }
+            return new ReadOnlyCollection<TOutput>(array);
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/DescriptorValidationException.cs b/csharp/src/ProtocolBuffers/Reflection/DescriptorValidationException.cs
index 855eda61..143671db 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/DescriptorValidationException.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/DescriptorValidationException.cs
@@ -1,80 +1,80 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Thrown when building descriptors fails because the source DescriptorProtos
-    /// are not valid.
-    /// </summary>
-    public sealed class DescriptorValidationException : Exception
-    {
-        private readonly String name;
-        private readonly string description;
-
-        /// <value>
-        /// The full name of the descriptor where the error occurred.
-        /// </value>
-        public String ProblemSymbolName
-        {
-            get { return name; }
-        }
-
-        /// <value>
-        /// A human-readable description of the error. (The Message property
-        /// is made up of the descriptor's name and this description.)
-        /// </value>
-        public string Description
-        {
-            get { return description; }
-        }
-
-        internal DescriptorValidationException(IDescriptor problemDescriptor, string description) :
-            base(problemDescriptor.FullName + ": " + description)
-        {
-            // Note that problemDescriptor may be partially uninitialized, so we
-            // don't want to expose it directly to the user.  So, we only provide
-            // the name and the original proto.
-            name = problemDescriptor.FullName;
-            this.description = description;
-        }
-
-        internal DescriptorValidationException(IDescriptor problemDescriptor, string description, Exception cause) :
-            base(problemDescriptor.FullName + ": " + description, cause)
-        {
-            name = problemDescriptor.FullName;
-            this.description = description;
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Thrown when building descriptors fails because the source DescriptorProtos
+    /// are not valid.
+    /// </summary>
+    public sealed class DescriptorValidationException : Exception
+    {
+        private readonly String name;
+        private readonly string description;
+
+        /// <value>
+        /// The full name of the descriptor where the error occurred.
+        /// </value>
+        public String ProblemSymbolName
+        {
+            get { return name; }
+        }
+
+        /// <value>
+        /// A human-readable description of the error. (The Message property
+        /// is made up of the descriptor's name and this description.)
+        /// </value>
+        public string Description
+        {
+            get { return description; }
+        }
+
+        internal DescriptorValidationException(IDescriptor problemDescriptor, string description) :
+            base(problemDescriptor.FullName + ": " + description)
+        {
+            // Note that problemDescriptor may be partially uninitialized, so we
+            // don't want to expose it directly to the user.  So, we only provide
+            // the name and the original proto.
+            name = problemDescriptor.FullName;
+            this.description = description;
+        }
+
+        internal DescriptorValidationException(IDescriptor problemDescriptor, string description, Exception cause) :
+            base(problemDescriptor.FullName + ": " + description, cause)
+        {
+            name = problemDescriptor.FullName;
+            this.description = description;
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/EnumDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/EnumDescriptor.cs
index 57860e61..eca85a06 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/EnumDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/EnumDescriptor.cs
@@ -1,109 +1,109 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System.Collections.Generic;
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Descriptor for an enum type in a .proto file.
-    /// </summary>
-    public sealed class EnumDescriptor : DescriptorBase
-    {
-        private readonly EnumDescriptorProto proto;
-        private readonly MessageDescriptor containingType;
-        private readonly IList<EnumValueDescriptor> values;
-
-        internal EnumDescriptor(EnumDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index)
-            : base(file, file.ComputeFullName(parent, proto.Name), index)
-        {
-            this.proto = proto;
-            containingType = parent;
-
-            if (proto.Value.Count == 0)
-            {
-                // We cannot allow enums with no values because this would mean there
-                // would be no valid default value for fields of this type.
-                throw new DescriptorValidationException(this, "Enums must contain at least one value.");
-            }
-
-            values = DescriptorUtil.ConvertAndMakeReadOnly(proto.Value,
-                                                           (value, i) => new EnumValueDescriptor(value, file, this, i));
-
-            File.DescriptorPool.AddSymbol(this);
-        }
-
-        internal EnumDescriptorProto Proto { get { return proto; } }
-
-        /// <summary>
-        /// The brief name of the descriptor's target.
-        /// </summary>
-        public override string Name { get { return proto.Name; } }
-
-        /// <value>
-        /// If this is a nested type, get the outer descriptor, otherwise null.
-        /// </value>
-        public MessageDescriptor ContainingType
-        {
-            get { return containingType; }
-        }
-
-        /// <value>
-        /// An unmodifiable list of defined value descriptors for this enum.
-        /// </value>
-        public IList<EnumValueDescriptor> Values
-        {
-            get { return values; }
-        }
-
-        /// <summary>
-        /// Finds an enum value by number. If multiple enum values have the
-        /// same number, this returns the first defined value with that number.
-        /// If there is no value for the given number, this returns <c>null</c>.
-        /// </summary>
-        public EnumValueDescriptor FindValueByNumber(int number)
-        {
-            return File.DescriptorPool.FindEnumValueByNumber(this, number);
-        }
-
-        /// <summary>
-        /// Finds an enum value by name.
-        /// </summary>
-        /// <param name="name">The unqualified name of the value (e.g. "FOO").</param>
-        /// <returns>The value's descriptor, or null if not found.</returns>
-        public EnumValueDescriptor FindValueByName(string name)
-        {
-            return File.DescriptorPool.FindSymbol<EnumValueDescriptor>(FullName + "." + name);
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System.Collections.Generic;
+using Google.Protobuf.DescriptorProtos;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Descriptor for an enum type in a .proto file.
+    /// </summary>
+    public sealed class EnumDescriptor : DescriptorBase
+    {
+        private readonly EnumDescriptorProto proto;
+        private readonly MessageDescriptor containingType;
+        private readonly IList<EnumValueDescriptor> values;
+
+        internal EnumDescriptor(EnumDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index)
+            : base(file, file.ComputeFullName(parent, proto.Name), index)
+        {
+            this.proto = proto;
+            containingType = parent;
+
+            if (proto.Value.Count == 0)
+            {
+                // We cannot allow enums with no values because this would mean there
+                // would be no valid default value for fields of this type.
+                throw new DescriptorValidationException(this, "Enums must contain at least one value.");
+            }
+
+            values = DescriptorUtil.ConvertAndMakeReadOnly(proto.Value,
+                                                           (value, i) => new EnumValueDescriptor(value, file, this, i));
+
+            File.DescriptorPool.AddSymbol(this);
+        }
+
+        internal EnumDescriptorProto Proto { get { return proto; } }
+
+        /// <summary>
+        /// The brief name of the descriptor's target.
+        /// </summary>
+        public override string Name { get { return proto.Name; } }
+
+        /// <value>
+        /// If this is a nested type, get the outer descriptor, otherwise null.
+        /// </value>
+        public MessageDescriptor ContainingType
+        {
+            get { return containingType; }
+        }
+
+        /// <value>
+        /// An unmodifiable list of defined value descriptors for this enum.
+        /// </value>
+        public IList<EnumValueDescriptor> Values
+        {
+            get { return values; }
+        }
+
+        /// <summary>
+        /// Finds an enum value by number. If multiple enum values have the
+        /// same number, this returns the first defined value with that number.
+        /// If there is no value for the given number, this returns <c>null</c>.
+        /// </summary>
+        public EnumValueDescriptor FindValueByNumber(int number)
+        {
+            return File.DescriptorPool.FindEnumValueByNumber(this, number);
+        }
+
+        /// <summary>
+        /// Finds an enum value by name.
+        /// </summary>
+        /// <param name="name">The unqualified name of the value (e.g. "FOO").</param>
+        /// <returns>The value's descriptor, or null if not found.</returns>
+        public EnumValueDescriptor FindValueByName(string name)
+        {
+            return File.DescriptorPool.FindSymbol<EnumValueDescriptor>(FullName + "." + name);
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/EnumValueDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/EnumValueDescriptor.cs
index e609b1f8..9c225676 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/EnumValueDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/EnumValueDescriptor.cs
@@ -1,63 +1,63 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Descriptor for a single enum value within an enum in a .proto file.
-    /// </summary>
-    public sealed class EnumValueDescriptor : DescriptorBase                                            
-    {
-        private readonly EnumDescriptor enumDescriptor;
-        private readonly EnumValueDescriptorProto proto;
-
-        internal EnumValueDescriptor(EnumValueDescriptorProto proto, FileDescriptor file,
-                                     EnumDescriptor parent, int index)
-            : base(file, parent.FullName + "." + proto.Name, index)
-        {
-            this.proto = proto;
-            enumDescriptor = parent;
-            file.DescriptorPool.AddSymbol(this);
-            file.DescriptorPool.AddEnumValueByNumber(this);
-        }
-
-        internal EnumValueDescriptorProto Proto { get { return proto; } }
-        
-        public override string Name { get { return proto.Name; } }
-
-        public int Number { get { return Proto.Number; } }
-
-        public EnumDescriptor EnumDescriptor { get { return enumDescriptor; } }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using Google.Protobuf.DescriptorProtos;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Descriptor for a single enum value within an enum in a .proto file.
+    /// </summary>
+    public sealed class EnumValueDescriptor : DescriptorBase                                            
+    {
+        private readonly EnumDescriptor enumDescriptor;
+        private readonly EnumValueDescriptorProto proto;
+
+        internal EnumValueDescriptor(EnumValueDescriptorProto proto, FileDescriptor file,
+                                     EnumDescriptor parent, int index)
+            : base(file, parent.FullName + "." + proto.Name, index)
+        {
+            this.proto = proto;
+            enumDescriptor = parent;
+            file.DescriptorPool.AddSymbol(this);
+            file.DescriptorPool.AddEnumValueByNumber(this);
+        }
+
+        internal EnumValueDescriptorProto Proto { get { return proto; } }
+        
+        public override string Name { get { return proto.Name; } }
+
+        public int Number { get { return Proto.Number; } }
+
+        public EnumDescriptor EnumDescriptor { get { return enumDescriptor; } }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorBase.cs b/csharp/src/ProtocolBuffers/Reflection/FieldAccessorBase.cs
index 2a3e5b8b..39a63b47 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorBase.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/FieldAccessorBase.cs
@@ -32,9 +32,8 @@
 
 using System;
 using System.Reflection;
-using Google.Protobuf.Descriptors;
 
-namespace Google.Protobuf.FieldAccess
+namespace Google.Protobuf.Reflection
 {
     /// <summary>
     /// Base class for field accessors.
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs b/csharp/src/ProtocolBuffers/Reflection/FieldAccessorTable.cs
index 80be93f5..24fcbc64 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/FieldAccessorTable.cs
@@ -1,98 +1,97 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Collections.ObjectModel;
-using Google.Protobuf.Descriptors;
-
-namespace Google.Protobuf.FieldAccess
-{
-    /// <summary>
-    /// Provides access to fields in generated messages via reflection.
-    /// </summary>
-    public sealed class FieldAccessorTable
-    {
-        private readonly ReadOnlyCollection<IFieldAccessor> accessors;
-        private readonly ReadOnlyCollection<OneofAccessor> oneofs;
-        private readonly MessageDescriptor descriptor;
-
-        /// <summary>
-        /// Constructs a FieldAccessorTable for a particular message class.
-        /// Only one FieldAccessorTable should be constructed per class.
-        /// </summary>
-        /// <param name="type">The CLR type for the message.</param>
-        /// <param name="descriptor">The type's descriptor</param>
-        /// <param name="propertyNames">The Pascal-case names of all the field-based properties in the message.</param>
-        public FieldAccessorTable(Type type, MessageDescriptor descriptor, string[] propertyNames, string[] oneofPropertyNames)
-        {
-            this.descriptor = descriptor;
-            var accessorsArray = new IFieldAccessor[descriptor.Fields.Count];
-            for (int i = 0; i < accessorsArray.Length; i++)
-            {
-                var field = descriptor.Fields[i];
-                var name = propertyNames[i];
-                accessorsArray[i] =
-                    field.IsMap ? new MapFieldAccessor(type, name, field)
-                    : field.IsRepeated ? new RepeatedFieldAccessor(type, name, field)
-                    : (IFieldAccessor) new SingleFieldAccessor(type, name, field);
-            }
-            accessors = new ReadOnlyCollection<IFieldAccessor>(accessorsArray);
-            var oneofsArray = new OneofAccessor[descriptor.Oneofs.Count];
-            for (int i = 0; i < oneofsArray.Length; i++)
-            {
-                var oneof = descriptor.Oneofs[i];
-                oneofsArray[i] = new OneofAccessor(type, oneofPropertyNames[i], oneof);
-            }
-            oneofs = new ReadOnlyCollection<OneofAccessor>(oneofsArray);
-        }
-
-        // TODO: Validate the name here... should possibly make this type a more "general reflection access" type,
-        // bearing in mind the oneof parts to come as well.
-        /// <summary>
-        /// Returns all of the field accessors for the message type.
-        /// </summary>
-        public ReadOnlyCollection<IFieldAccessor> Accessors { get { return accessors; } }
-
-        public ReadOnlyCollection<OneofAccessor> Oneofs { get { return oneofs; } }
-
-        // TODO: Review this, as it's easy to get confused between FieldNumber and Index.
-        // Currently only used to get an accessor related to a oneof... maybe just make that simpler?
-        public IFieldAccessor this[int fieldNumber]
-        {
-            get
-            {
-                FieldDescriptor field = descriptor.FindFieldByNumber(fieldNumber);
-                return accessors[field.Index];
-            }
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.ObjectModel;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Provides access to fields in generated messages via reflection.
+    /// </summary>
+    public sealed class FieldAccessorTable
+    {
+        private readonly ReadOnlyCollection<IFieldAccessor> accessors;
+        private readonly ReadOnlyCollection<OneofAccessor> oneofs;
+        private readonly MessageDescriptor descriptor;
+
+        /// <summary>
+        /// Constructs a FieldAccessorTable for a particular message class.
+        /// Only one FieldAccessorTable should be constructed per class.
+        /// </summary>
+        /// <param name="type">The CLR type for the message.</param>
+        /// <param name="descriptor">The type's descriptor</param>
+        /// <param name="propertyNames">The Pascal-case names of all the field-based properties in the message.</param>
+        public FieldAccessorTable(Type type, MessageDescriptor descriptor, string[] propertyNames, string[] oneofPropertyNames)
+        {
+            this.descriptor = descriptor;
+            var accessorsArray = new IFieldAccessor[descriptor.Fields.Count];
+            for (int i = 0; i < accessorsArray.Length; i++)
+            {
+                var field = descriptor.Fields[i];
+                var name = propertyNames[i];
+                accessorsArray[i] =
+                    field.IsMap ? new MapFieldAccessor(type, name, field)
+                    : field.IsRepeated ? new RepeatedFieldAccessor(type, name, field)
+                    : (IFieldAccessor) new SingleFieldAccessor(type, name, field);
+            }
+            accessors = new ReadOnlyCollection<IFieldAccessor>(accessorsArray);
+            var oneofsArray = new OneofAccessor[descriptor.Oneofs.Count];
+            for (int i = 0; i < oneofsArray.Length; i++)
+            {
+                var oneof = descriptor.Oneofs[i];
+                oneofsArray[i] = new OneofAccessor(type, oneofPropertyNames[i], oneof);
+            }
+            oneofs = new ReadOnlyCollection<OneofAccessor>(oneofsArray);
+        }
+
+        // TODO: Validate the name here... should possibly make this type a more "general reflection access" type,
+        // bearing in mind the oneof parts to come as well.
+        /// <summary>
+        /// Returns all of the field accessors for the message type.
+        /// </summary>
+        public ReadOnlyCollection<IFieldAccessor> Accessors { get { return accessors; } }
+
+        public ReadOnlyCollection<OneofAccessor> Oneofs { get { return oneofs; } }
+
+        // TODO: Review this, as it's easy to get confused between FieldNumber and Index.
+        // Currently only used to get an accessor related to a oneof... maybe just make that simpler?
+        public IFieldAccessor this[int fieldNumber]
+        {
+            get
+            {
+                FieldDescriptor field = descriptor.FindFieldByNumber(fieldNumber);
+                return accessors[field.Index];
+            }
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/FieldDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/FieldDescriptor.cs
index 7af69bbb..99f85517 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/FieldDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/FieldDescriptor.cs
@@ -1,293 +1,293 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Descriptor for a field or extension within a message in a .proto file.
-    /// </summary>
-    public sealed class FieldDescriptor : DescriptorBase, IComparable<FieldDescriptor>
-    {
-        private readonly FieldDescriptorProto proto;
-        private EnumDescriptor enumType;
-        private MessageDescriptor messageType;
-        private readonly MessageDescriptor containingType;
-        private readonly OneofDescriptor containingOneof;
-        private FieldType fieldType;
-
-        internal FieldDescriptor(FieldDescriptorProto proto, FileDescriptor file,
-                                 MessageDescriptor parent, int index)
-            : base(file, file.ComputeFullName(parent, proto.Name), index)
-        {
-            this.proto = proto;
-            if (proto.Type != 0)
-            {
-                fieldType = GetFieldTypeFromProtoType(proto.Type);
-            }
-
-            if (FieldNumber <= 0)
-            {
-                throw new DescriptorValidationException(this,
-                                                        "Field numbers must be positive integers.");
-            }
-            containingType = parent;
-            // OneofIndex "defaults" to -1 due to a hack in FieldDescriptor.OnConstruction.
-            if (proto.OneofIndex != -1)
-            {
-                if (proto.OneofIndex < 0 || proto.OneofIndex >= parent.Proto.OneofDecl.Count)
-                {
-                    throw new DescriptorValidationException(this,
-                        "FieldDescriptorProto.oneof_index is out of range for type " + parent.Name);
-                }
-                containingOneof = parent.Oneofs[proto.OneofIndex];
-            }
-
-            file.DescriptorPool.AddSymbol(this);
-        }
-
-        /// <summary>
-        /// The brief name of the descriptor's target.
-        /// </summary>
-        public override string Name { get { return proto.Name; } }
-
-        internal FieldDescriptorProto Proto { get { return proto; } }
-        
-        /// <summary>
-        /// Maps a field type as included in the .proto file to a FieldType.
-        /// </summary>
-        private static FieldType GetFieldTypeFromProtoType(FieldDescriptorProto.Types.Type type)
-        {
-            switch (type)
-            {
-                case FieldDescriptorProto.Types.Type.TYPE_DOUBLE:
-                    return FieldType.Double;
-                case FieldDescriptorProto.Types.Type.TYPE_FLOAT:
-                    return FieldType.Float;
-                case FieldDescriptorProto.Types.Type.TYPE_INT64:
-                    return FieldType.Int64;
-                case FieldDescriptorProto.Types.Type.TYPE_UINT64:
-                    return FieldType.UInt64;
-                case FieldDescriptorProto.Types.Type.TYPE_INT32:
-                    return FieldType.Int32;
-                case FieldDescriptorProto.Types.Type.TYPE_FIXED64:
-                    return FieldType.Fixed64;
-                case FieldDescriptorProto.Types.Type.TYPE_FIXED32:
-                    return FieldType.Fixed32;
-                case FieldDescriptorProto.Types.Type.TYPE_BOOL:
-                    return FieldType.Bool;
-                case FieldDescriptorProto.Types.Type.TYPE_STRING:
-                    return FieldType.String;
-                case FieldDescriptorProto.Types.Type.TYPE_GROUP:
-                    return FieldType.Group;
-                case FieldDescriptorProto.Types.Type.TYPE_MESSAGE:
-                    return FieldType.Message;
-                case FieldDescriptorProto.Types.Type.TYPE_BYTES:
-                    return FieldType.Bytes;
-                case FieldDescriptorProto.Types.Type.TYPE_UINT32:
-                    return FieldType.UInt32;
-                case FieldDescriptorProto.Types.Type.TYPE_ENUM:
-                    return FieldType.Enum;
-                case FieldDescriptorProto.Types.Type.TYPE_SFIXED32:
-                    return FieldType.SFixed32;
-                case FieldDescriptorProto.Types.Type.TYPE_SFIXED64:
-                    return FieldType.SFixed64;
-                case FieldDescriptorProto.Types.Type.TYPE_SINT32:
-                    return FieldType.SInt32;
-                case FieldDescriptorProto.Types.Type.TYPE_SINT64:
-                    return FieldType.SInt64;
-                default:
-                    throw new ArgumentException("Invalid type specified");
-            }
-        }        
-
-        public bool IsRepeated
-        {
-            get { return Proto.Label == FieldDescriptorProto.Types.Label.LABEL_REPEATED; }
-        }
-
-        public bool IsMap
-        {
-            get { return fieldType == FieldType.Message && messageType.Proto.Options != null && messageType.Proto.Options.MapEntry; }
-        }
-
-        public bool IsPacked
-        {
-            get { return Proto.Options != null && Proto.Options.Packed; }
-        }        
-
-        /// <summary>
-        /// Get the field's containing type. For extensions, this is the type being
-        /// extended, not the location where the extension was defined. See
-        /// <see cref="ExtensionScope" />.
-        /// </summary>
-        public MessageDescriptor ContainingType
-        {
-            get { return containingType; }
-        }
-
-        public OneofDescriptor ContainingOneof
-        {
-            get { return containingOneof; }
-        }        
-
-        public FieldType FieldType
-        {
-            get { return fieldType; }
-        }
-
-        public int FieldNumber
-        {
-            get { return Proto.Number; }
-        }
-
-        /// <summary>
-        /// Compares this descriptor with another one, ordering in "canonical" order
-        /// which simply means ascending order by field number. <paramref name="other"/>
-        /// must be a field of the same type, i.e. the <see cref="ContainingType"/> of
-        /// both fields must be the same.
-        /// </summary>
-        public int CompareTo(FieldDescriptor other)
-        {
-            if (other.containingType != containingType)
-            {
-                throw new ArgumentException("FieldDescriptors can only be compared to other FieldDescriptors " +
-                                            "for fields of the same message type.");
-            }
-            return FieldNumber - other.FieldNumber;
-        }
-
-        /// <summary>
-        /// For enum fields, returns the field's type.
-        /// </summary>
-        public EnumDescriptor EnumType
-        {
-            get
-            {
-                if (fieldType != FieldType.Enum)
-                {
-                    throw new InvalidOperationException("EnumType is only valid for enum fields.");
-                }
-                return enumType;
-            }
-        }
-
-        /// <summary>
-        /// For embedded message and group fields, returns the field's type.
-        /// </summary>
-        public MessageDescriptor MessageType
-        {
-            get
-            {
-                if (fieldType != FieldType.Message)
-                {
-                    throw new InvalidOperationException("MessageType is only valid for enum fields.");
-                }
-                return messageType;
-            }
-        }
-
-        /// <summary>
-        /// Look up and cross-link all field types etc.
-        /// </summary>
-        internal void CrossLink()
-        {
-            if (Proto.TypeName != "")
-            {
-                IDescriptor typeDescriptor =
-                    File.DescriptorPool.LookupSymbol(Proto.TypeName, this);
-
-                if (Proto.Type != 0)
-                {
-                    // Choose field type based on symbol.
-                    if (typeDescriptor is MessageDescriptor)
-                    {
-                        fieldType = FieldType.Message;
-                    }
-                    else if (typeDescriptor is EnumDescriptor)
-                    {
-                        fieldType = FieldType.Enum;
-                    }
-                    else
-                    {
-                        throw new DescriptorValidationException(this, "\"" + Proto.TypeName + "\" is not a type.");
-                    }
-                }
-
-                if (fieldType == FieldType.Message)
-                {
-                    if (!(typeDescriptor is MessageDescriptor))
-                    {
-                        throw new DescriptorValidationException(this,
-                                                                "\"" + Proto.TypeName + "\" is not a message type.");
-                    }
-                    messageType = (MessageDescriptor) typeDescriptor;
-
-                    if (Proto.DefaultValue != "")
-                    {
-                        throw new DescriptorValidationException(this, "Messages can't have default values.");
-                    }
-                }
-                else if (fieldType == FieldType.Enum)
-                {
-                    if (!(typeDescriptor is EnumDescriptor))
-                    {
-                        throw new DescriptorValidationException(this, "\"" + Proto.TypeName + "\" is not an enum type.");
-                    }
-                    enumType = (EnumDescriptor) typeDescriptor;
-                }
-                else
-                {
-                    throw new DescriptorValidationException(this, "Field with primitive type has type_name.");
-                }
-            }
-            else
-            {
-                if (fieldType == FieldType.Message || fieldType == FieldType.Enum)
-                {
-                    throw new DescriptorValidationException(this, "Field with message or enum type missing type_name.");
-                }
-            }
-
-            // Note: no attempt to perform any default value parsing
-
-            File.DescriptorPool.AddFieldByNumber(this);
-
-            if (containingType != null && containingType.Proto.Options != null && containingType.Proto.Options.MessageSetWireFormat)
-            {
-                throw new DescriptorValidationException(this, "MessageSet format is not supported.");
-            }
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using Google.Protobuf.DescriptorProtos;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Descriptor for a field or extension within a message in a .proto file.
+    /// </summary>
+    public sealed class FieldDescriptor : DescriptorBase, IComparable<FieldDescriptor>
+    {
+        private readonly FieldDescriptorProto proto;
+        private EnumDescriptor enumType;
+        private MessageDescriptor messageType;
+        private readonly MessageDescriptor containingType;
+        private readonly OneofDescriptor containingOneof;
+        private FieldType fieldType;
+
+        internal FieldDescriptor(FieldDescriptorProto proto, FileDescriptor file,
+                                 MessageDescriptor parent, int index)
+            : base(file, file.ComputeFullName(parent, proto.Name), index)
+        {
+            this.proto = proto;
+            if (proto.Type != 0)
+            {
+                fieldType = GetFieldTypeFromProtoType(proto.Type);
+            }
+
+            if (FieldNumber <= 0)
+            {
+                throw new DescriptorValidationException(this,
+                                                        "Field numbers must be positive integers.");
+            }
+            containingType = parent;
+            // OneofIndex "defaults" to -1 due to a hack in FieldDescriptor.OnConstruction.
+            if (proto.OneofIndex != -1)
+            {
+                if (proto.OneofIndex < 0 || proto.OneofIndex >= parent.Proto.OneofDecl.Count)
+                {
+                    throw new DescriptorValidationException(this,
+                        "FieldDescriptorProto.oneof_index is out of range for type " + parent.Name);
+                }
+                containingOneof = parent.Oneofs[proto.OneofIndex];
+            }
+
+            file.DescriptorPool.AddSymbol(this);
+        }
+
+        /// <summary>
+        /// The brief name of the descriptor's target.
+        /// </summary>
+        public override string Name { get { return proto.Name; } }
+
+        internal FieldDescriptorProto Proto { get { return proto; } }
+        
+        /// <summary>
+        /// Maps a field type as included in the .proto file to a FieldType.
+        /// </summary>
+        private static FieldType GetFieldTypeFromProtoType(FieldDescriptorProto.Types.Type type)
+        {
+            switch (type)
+            {
+                case FieldDescriptorProto.Types.Type.TYPE_DOUBLE:
+                    return FieldType.Double;
+                case FieldDescriptorProto.Types.Type.TYPE_FLOAT:
+                    return FieldType.Float;
+                case FieldDescriptorProto.Types.Type.TYPE_INT64:
+                    return FieldType.Int64;
+                case FieldDescriptorProto.Types.Type.TYPE_UINT64:
+                    return FieldType.UInt64;
+                case FieldDescriptorProto.Types.Type.TYPE_INT32:
+                    return FieldType.Int32;
+                case FieldDescriptorProto.Types.Type.TYPE_FIXED64:
+                    return FieldType.Fixed64;
+                case FieldDescriptorProto.Types.Type.TYPE_FIXED32:
+                    return FieldType.Fixed32;
+                case FieldDescriptorProto.Types.Type.TYPE_BOOL:
+                    return FieldType.Bool;
+                case FieldDescriptorProto.Types.Type.TYPE_STRING:
+                    return FieldType.String;
+                case FieldDescriptorProto.Types.Type.TYPE_GROUP:
+                    return FieldType.Group;
+                case FieldDescriptorProto.Types.Type.TYPE_MESSAGE:
+                    return FieldType.Message;
+                case FieldDescriptorProto.Types.Type.TYPE_BYTES:
+                    return FieldType.Bytes;
+                case FieldDescriptorProto.Types.Type.TYPE_UINT32:
+                    return FieldType.UInt32;
+                case FieldDescriptorProto.Types.Type.TYPE_ENUM:
+                    return FieldType.Enum;
+                case FieldDescriptorProto.Types.Type.TYPE_SFIXED32:
+                    return FieldType.SFixed32;
+                case FieldDescriptorProto.Types.Type.TYPE_SFIXED64:
+                    return FieldType.SFixed64;
+                case FieldDescriptorProto.Types.Type.TYPE_SINT32:
+                    return FieldType.SInt32;
+                case FieldDescriptorProto.Types.Type.TYPE_SINT64:
+                    return FieldType.SInt64;
+                default:
+                    throw new ArgumentException("Invalid type specified");
+            }
+        }        
+
+        public bool IsRepeated
+        {
+            get { return Proto.Label == FieldDescriptorProto.Types.Label.LABEL_REPEATED; }
+        }
+
+        public bool IsMap
+        {
+            get { return fieldType == FieldType.Message && messageType.Proto.Options != null && messageType.Proto.Options.MapEntry; }
+        }
+
+        public bool IsPacked
+        {
+            get { return Proto.Options != null && Proto.Options.Packed; }
+        }        
+
+        /// <summary>
+        /// Get the field's containing type. For extensions, this is the type being
+        /// extended, not the location where the extension was defined. See
+        /// <see cref="ExtensionScope" />.
+        /// </summary>
+        public MessageDescriptor ContainingType
+        {
+            get { return containingType; }
+        }
+
+        public OneofDescriptor ContainingOneof
+        {
+            get { return containingOneof; }
+        }        
+
+        public FieldType FieldType
+        {
+            get { return fieldType; }
+        }
+
+        public int FieldNumber
+        {
+            get { return Proto.Number; }
+        }
+
+        /// <summary>
+        /// Compares this descriptor with another one, ordering in "canonical" order
+        /// which simply means ascending order by field number. <paramref name="other"/>
+        /// must be a field of the same type, i.e. the <see cref="ContainingType"/> of
+        /// both fields must be the same.
+        /// </summary>
+        public int CompareTo(FieldDescriptor other)
+        {
+            if (other.containingType != containingType)
+            {
+                throw new ArgumentException("FieldDescriptors can only be compared to other FieldDescriptors " +
+                                            "for fields of the same message type.");
+            }
+            return FieldNumber - other.FieldNumber;
+        }
+
+        /// <summary>
+        /// For enum fields, returns the field's type.
+        /// </summary>
+        public EnumDescriptor EnumType
+        {
+            get
+            {
+                if (fieldType != FieldType.Enum)
+                {
+                    throw new InvalidOperationException("EnumType is only valid for enum fields.");
+                }
+                return enumType;
+            }
+        }
+
+        /// <summary>
+        /// For embedded message and group fields, returns the field's type.
+        /// </summary>
+        public MessageDescriptor MessageType
+        {
+            get
+            {
+                if (fieldType != FieldType.Message)
+                {
+                    throw new InvalidOperationException("MessageType is only valid for enum fields.");
+                }
+                return messageType;
+            }
+        }
+
+        /// <summary>
+        /// Look up and cross-link all field types etc.
+        /// </summary>
+        internal void CrossLink()
+        {
+            if (Proto.TypeName != "")
+            {
+                IDescriptor typeDescriptor =
+                    File.DescriptorPool.LookupSymbol(Proto.TypeName, this);
+
+                if (Proto.Type != 0)
+                {
+                    // Choose field type based on symbol.
+                    if (typeDescriptor is MessageDescriptor)
+                    {
+                        fieldType = FieldType.Message;
+                    }
+                    else if (typeDescriptor is EnumDescriptor)
+                    {
+                        fieldType = FieldType.Enum;
+                    }
+                    else
+                    {
+                        throw new DescriptorValidationException(this, "\"" + Proto.TypeName + "\" is not a type.");
+                    }
+                }
+
+                if (fieldType == FieldType.Message)
+                {
+                    if (!(typeDescriptor is MessageDescriptor))
+                    {
+                        throw new DescriptorValidationException(this,
+                                                                "\"" + Proto.TypeName + "\" is not a message type.");
+                    }
+                    messageType = (MessageDescriptor) typeDescriptor;
+
+                    if (Proto.DefaultValue != "")
+                    {
+                        throw new DescriptorValidationException(this, "Messages can't have default values.");
+                    }
+                }
+                else if (fieldType == FieldType.Enum)
+                {
+                    if (!(typeDescriptor is EnumDescriptor))
+                    {
+                        throw new DescriptorValidationException(this, "\"" + Proto.TypeName + "\" is not an enum type.");
+                    }
+                    enumType = (EnumDescriptor) typeDescriptor;
+                }
+                else
+                {
+                    throw new DescriptorValidationException(this, "Field with primitive type has type_name.");
+                }
+            }
+            else
+            {
+                if (fieldType == FieldType.Message || fieldType == FieldType.Enum)
+                {
+                    throw new DescriptorValidationException(this, "Field with message or enum type missing type_name.");
+                }
+            }
+
+            // Note: no attempt to perform any default value parsing
+
+            File.DescriptorPool.AddFieldByNumber(this);
+
+            if (containingType != null && containingType.Proto.Options != null && containingType.Proto.Options.MessageSetWireFormat)
+            {
+                throw new DescriptorValidationException(this, "MessageSet format is not supported.");
+            }
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/FieldType.cs b/csharp/src/ProtocolBuffers/Reflection/FieldType.cs
index 69851464..41fa702d 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/FieldType.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/FieldType.cs
@@ -1,60 +1,60 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Enumeration of all the possible field types. The odd formatting is to make it very clear
-    /// which attribute applies to which value, while maintaining a compact format.
-    /// </summary>
-    public enum FieldType
-    {
-        Double,
-        Float,
-        Int64,
-        UInt64,
-        Int32,
-        Fixed64,
-        Fixed32,
-        Bool,
-        String,
-        Group,
-        Message,
-        Bytes,
-        UInt32,
-        SFixed32,
-        SFixed64,
-        SInt32,
-        SInt64,
-        Enum
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Enumeration of all the possible field types. The odd formatting is to make it very clear
+    /// which attribute applies to which value, while maintaining a compact format.
+    /// </summary>
+    public enum FieldType
+    {
+        Double,
+        Float,
+        Int64,
+        UInt64,
+        Int32,
+        Fixed64,
+        Fixed32,
+        Bool,
+        String,
+        Group,
+        Message,
+        Bytes,
+        UInt32,
+        SFixed32,
+        SFixed64,
+        SInt32,
+        SInt64,
+        Enum
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/FileDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/FileDescriptor.cs
index 9d0bdfd3..7738e3b9 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/FileDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/FileDescriptor.cs
@@ -1,354 +1,354 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-using Google.Protobuf.DescriptorProtos;
-using FileOptions = Google.Protobuf.DescriptorProtos.FileOptions;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Describes a .proto file, including everything defined within.
-    /// IDescriptor is implemented such that the File property returns this descriptor,
-    /// and the FullName is the same as the Name.
-    /// </summary>
-    public sealed class FileDescriptor : IDescriptor
-    {
-        private readonly FileDescriptorProto proto;
-        private readonly IList<MessageDescriptor> messageTypes;
-        private readonly IList<EnumDescriptor> enumTypes;
-        private readonly IList<ServiceDescriptor> services;
-        private readonly IList<FileDescriptor> dependencies;
-        private readonly IList<FileDescriptor> publicDependencies;
-        private readonly DescriptorPool pool;
-
-        public enum ProtoSyntax
-        {
-            Proto2,
-            Proto3
-        }
-
-        public ProtoSyntax Syntax
-        {
-            get { return proto.Syntax == "proto3" ? ProtoSyntax.Proto3 : ProtoSyntax.Proto2; }
-        }
-
-        private FileDescriptor(FileDescriptorProto proto, FileDescriptor[] dependencies, DescriptorPool pool, bool allowUnknownDependencies)
-        {
-            this.pool = pool;
-            this.proto = proto;
-            this.dependencies = new ReadOnlyCollection<FileDescriptor>((FileDescriptor[]) dependencies.Clone());
-
-            publicDependencies = DeterminePublicDependencies(this, proto, dependencies, allowUnknownDependencies);
-
-            pool.AddPackage(Package, this);
-
-            messageTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.MessageType,
-                                                                 (message, index) =>
-                                                                 new MessageDescriptor(message, this, null, index));
-
-            enumTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.EnumType,
-                                                              (enumType, index) =>
-                                                              new EnumDescriptor(enumType, this, null, index));
-
-            services = DescriptorUtil.ConvertAndMakeReadOnly(proto.Service,
-                                                             (service, index) =>
-                                                             new ServiceDescriptor(service, this, index));
-        }
-
-        /// <summary>
-        /// Computes the full name of a descriptor within this file, with an optional parent message.
-        /// </summary>
-        internal string ComputeFullName(MessageDescriptor parent, string name)
-        {
-            if (parent != null)
-            {
-                return parent.FullName + "." + name;
-            }
-            if (Package.Length > 0)
-            {
-                return Package + "." + name;
-            }
-            return name;
-        }
-
-        /// <summary>
-        /// Extracts public dependencies from direct dependencies. This is a static method despite its
-        /// first parameter, as the value we're in the middle of constructing is only used for exceptions.
-        /// </summary>
-        private static IList<FileDescriptor> DeterminePublicDependencies(FileDescriptor @this, FileDescriptorProto proto, FileDescriptor[] dependencies, bool allowUnknownDependencies)
-        {
-            var nameToFileMap = new Dictionary<string, FileDescriptor>();
-            foreach (var file in dependencies)
-            {
-                nameToFileMap[file.Name] = file;
-            }
-            var publicDependencies = new List<FileDescriptor>();
-            for (int i = 0; i < proto.PublicDependency.Count; i++)
-            {
-                int index = proto.PublicDependency[i];
-                if (index < 0 || index >= proto.Dependency.Count)
-                {
-                    throw new DescriptorValidationException(@this, "Invalid public dependency index.");
-                }
-                string name = proto.Dependency[index];
-                FileDescriptor file = nameToFileMap[name];
-                if (file == null)
-                {
-                    if (!allowUnknownDependencies)
-                    {
-                        throw new DescriptorValidationException(@this, "Invalid public dependency: " + name);
-                    }
-                    // Ignore unknown dependencies.
-                }
-                else
-                {
-                    publicDependencies.Add(file);
-                }
-            }
-            return new ReadOnlyCollection<FileDescriptor>(publicDependencies);
-        }
-
-        /// <value>
-        /// The descriptor in its protocol message representation.
-        /// </value>
-        internal FileDescriptorProto Proto
-        {
-            get { return proto; }
-        }
-
-        /// <value>
-        /// The file name.
-        /// </value>
-        public string Name
-        {
-            get { return proto.Name; }
-        }
-
-        /// <summary>
-        /// The package as declared in the .proto file. This may or may not
-        /// be equivalent to the .NET namespace of the generated classes.
-        /// </summary>
-        public string Package
-        {
-            get { return proto.Package; }
-        }
-
-        /// <value>
-        /// Unmodifiable list of top-level message types declared in this file.
-        /// </value>
-        public IList<MessageDescriptor> MessageTypes
-        {
-            get { return messageTypes; }
-        }
-
-        /// <value>
-        /// Unmodifiable list of top-level enum types declared in this file.
-        /// </value>
-        public IList<EnumDescriptor> EnumTypes
-        {
-            get { return enumTypes; }
-        }
-
-        /// <value>
-        /// Unmodifiable list of top-level services declared in this file.
-        /// </value>
-        public IList<ServiceDescriptor> Services
-        {
-            get { return services; }
-        }
-
-        /// <value>
-        /// Unmodifiable list of this file's dependencies (imports).
-        /// </value>
-        public IList<FileDescriptor> Dependencies
-        {
-            get { return dependencies; }
-        }
-
-        /// <value>
-        /// Unmodifiable list of this file's public dependencies (public imports).
-        /// </value>
-        public IList<FileDescriptor> PublicDependencies
-        {
-            get { return publicDependencies; }
-        }
-
-        /// <value>
-        /// Implementation of IDescriptor.FullName - just returns the same as Name.
-        /// </value>
-        string IDescriptor.FullName
-        {
-            get { return Name; }
-        }
-
-        /// <value>
-        /// Implementation of IDescriptor.File - just returns this descriptor.
-        /// </value>
-        FileDescriptor IDescriptor.File
-        {
-            get { return this; }
-        }
-
-        /// <value>
-        /// Pool containing symbol descriptors.
-        /// </value>
-        internal DescriptorPool DescriptorPool
-        {
-            get { return pool; }
-        }
-
-        /// <summary>
-        /// Finds a type (message, enum, service or extension) in the file by name. Does not find nested types.
-        /// </summary>
-        /// <param name="name">The unqualified type name to look for.</param>
-        /// <typeparam name="T">The type of descriptor to look for (or ITypeDescriptor for any)</typeparam>
-        /// <returns>The type's descriptor, or null if not found.</returns>
-        public T FindTypeByName<T>(String name)
-            where T : class, IDescriptor
-        {
-            // Don't allow looking up nested types.  This will make optimization
-            // easier later.
-            if (name.IndexOf('.') != -1)
-            {
-                return null;
-            }
-            if (Package.Length > 0)
-            {
-                name = Package + "." + name;
-            }
-            T result = pool.FindSymbol<T>(name);
-            if (result != null && result.File == this)
-            {
-                return result;
-            }
-            return null;
-        }
-        
-        /// <summary>
-        /// Builds a FileDescriptor from its protocol buffer representation.
-        /// </summary>
-        /// <param name="proto">The protocol message form of the FileDescriptor.</param>
-        /// <param name="dependencies">FileDescriptors corresponding to all of the
-        /// file's dependencies, in the exact order listed in the .proto file. May be null,
-        /// in which case it is treated as an empty array.</param>
-        /// <param name="allowUnknownDependencies">Whether unknown dependencies are ignored (true) or cause an exception to be thrown (false).</param>
-        /// <exception cref="DescriptorValidationException">If <paramref name="proto"/> is not
-        /// a valid descriptor. This can occur for a number of reasons, such as a field
-        /// having an undefined type or because two messages were defined with the same name.</exception>
-        private static FileDescriptor BuildFrom(FileDescriptorProto proto, FileDescriptor[] dependencies, bool allowUnknownDependencies)
-        {
-            // Building descriptors involves two steps: translating and linking.
-            // In the translation step (implemented by FileDescriptor's
-            // constructor), we build an object tree mirroring the
-            // FileDescriptorProto's tree and put all of the descriptors into the
-            // DescriptorPool's lookup tables.  In the linking step, we look up all
-            // type references in the DescriptorPool, so that, for example, a
-            // FieldDescriptor for an embedded message contains a pointer directly
-            // to the Descriptor for that message's type.  We also detect undefined
-            // types in the linking step.
-            if (dependencies == null)
-            {
-                dependencies = new FileDescriptor[0];
-            }
-
-            DescriptorPool pool = new DescriptorPool(dependencies);
-            FileDescriptor result = new FileDescriptor(proto, dependencies, pool, allowUnknownDependencies);
-
-            // TODO(jonskeet): Reinstate these checks, or get rid of them entirely. They aren't in the Java code,
-            // and fail for the CustomOptions test right now. (We get "descriptor.proto" vs "google/protobuf/descriptor.proto".)
-            //if (dependencies.Length != proto.DependencyCount)
-            //{
-            //    throw new DescriptorValidationException(result,
-            //                                            "Dependencies passed to FileDescriptor.BuildFrom() don't match " +
-            //                                            "those listed in the FileDescriptorProto.");
-            //}
-            //for (int i = 0; i < proto.DependencyCount; i++)
-            //{
-            //    if (dependencies[i].Name != proto.DependencyList[i])
-            //    {
-            //        throw new DescriptorValidationException(result,
-            //                                                "Dependencies passed to FileDescriptor.BuildFrom() don't match " +
-            //                                                "those listed in the FileDescriptorProto.");
-            //    }
-            //}
-
-            result.CrossLink();
-            return result;
-        }
-
-        private void CrossLink()
-        {
-            foreach (MessageDescriptor message in messageTypes)
-            {
-                message.CrossLink();
-            }
-
-            foreach (ServiceDescriptor service in services)
-            {
-                service.CrossLink();
-            }
-        }
-
-        public static FileDescriptor InternalBuildGeneratedFileFrom(byte[] descriptorData,
-                                                                    FileDescriptor[] dependencies)
-        {
-            FileDescriptorProto proto;
-            try
-            {
-                proto = FileDescriptorProto.Parser.ParseFrom(descriptorData);
-            }
-            catch (InvalidProtocolBufferException e)
-            {
-                throw new ArgumentException("Failed to parse protocol buffer descriptor for generated code.", e);
-            }
-
-            try
-            {
-                // When building descriptors for generated code, we allow unknown
-                // dependencies by default.
-                return BuildFrom(proto, dependencies, true);
-            }
-            catch (DescriptorValidationException e)
-            {
-                throw new ArgumentException("Invalid embedded descriptor for \"" + proto.Name + "\".", e);
-            }
-        }
-        
-        public override string ToString()
-        {
-            return "FileDescriptor for " + proto.Name;
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Google.Protobuf.DescriptorProtos;
+using FileOptions = Google.Protobuf.DescriptorProtos.FileOptions;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Describes a .proto file, including everything defined within.
+    /// IDescriptor is implemented such that the File property returns this descriptor,
+    /// and the FullName is the same as the Name.
+    /// </summary>
+    public sealed class FileDescriptor : IDescriptor
+    {
+        private readonly FileDescriptorProto proto;
+        private readonly IList<MessageDescriptor> messageTypes;
+        private readonly IList<EnumDescriptor> enumTypes;
+        private readonly IList<ServiceDescriptor> services;
+        private readonly IList<FileDescriptor> dependencies;
+        private readonly IList<FileDescriptor> publicDependencies;
+        private readonly DescriptorPool pool;
+
+        public enum ProtoSyntax
+        {
+            Proto2,
+            Proto3
+        }
+
+        public ProtoSyntax Syntax
+        {
+            get { return proto.Syntax == "proto3" ? ProtoSyntax.Proto3 : ProtoSyntax.Proto2; }
+        }
+
+        private FileDescriptor(FileDescriptorProto proto, FileDescriptor[] dependencies, DescriptorPool pool, bool allowUnknownDependencies)
+        {
+            this.pool = pool;
+            this.proto = proto;
+            this.dependencies = new ReadOnlyCollection<FileDescriptor>((FileDescriptor[]) dependencies.Clone());
+
+            publicDependencies = DeterminePublicDependencies(this, proto, dependencies, allowUnknownDependencies);
+
+            pool.AddPackage(Package, this);
+
+            messageTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.MessageType,
+                                                                 (message, index) =>
+                                                                 new MessageDescriptor(message, this, null, index));
+
+            enumTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.EnumType,
+                                                              (enumType, index) =>
+                                                              new EnumDescriptor(enumType, this, null, index));
+
+            services = DescriptorUtil.ConvertAndMakeReadOnly(proto.Service,
+                                                             (service, index) =>
+                                                             new ServiceDescriptor(service, this, index));
+        }
+
+        /// <summary>
+        /// Computes the full name of a descriptor within this file, with an optional parent message.
+        /// </summary>
+        internal string ComputeFullName(MessageDescriptor parent, string name)
+        {
+            if (parent != null)
+            {
+                return parent.FullName + "." + name;
+            }
+            if (Package.Length > 0)
+            {
+                return Package + "." + name;
+            }
+            return name;
+        }
+
+        /// <summary>
+        /// Extracts public dependencies from direct dependencies. This is a static method despite its
+        /// first parameter, as the value we're in the middle of constructing is only used for exceptions.
+        /// </summary>
+        private static IList<FileDescriptor> DeterminePublicDependencies(FileDescriptor @this, FileDescriptorProto proto, FileDescriptor[] dependencies, bool allowUnknownDependencies)
+        {
+            var nameToFileMap = new Dictionary<string, FileDescriptor>();
+            foreach (var file in dependencies)
+            {
+                nameToFileMap[file.Name] = file;
+            }
+            var publicDependencies = new List<FileDescriptor>();
+            for (int i = 0; i < proto.PublicDependency.Count; i++)
+            {
+                int index = proto.PublicDependency[i];
+                if (index < 0 || index >= proto.Dependency.Count)
+                {
+                    throw new DescriptorValidationException(@this, "Invalid public dependency index.");
+                }
+                string name = proto.Dependency[index];
+                FileDescriptor file = nameToFileMap[name];
+                if (file == null)
+                {
+                    if (!allowUnknownDependencies)
+                    {
+                        throw new DescriptorValidationException(@this, "Invalid public dependency: " + name);
+                    }
+                    // Ignore unknown dependencies.
+                }
+                else
+                {
+                    publicDependencies.Add(file);
+                }
+            }
+            return new ReadOnlyCollection<FileDescriptor>(publicDependencies);
+        }
+
+        /// <value>
+        /// The descriptor in its protocol message representation.
+        /// </value>
+        internal FileDescriptorProto Proto
+        {
+            get { return proto; }
+        }
+
+        /// <value>
+        /// The file name.
+        /// </value>
+        public string Name
+        {
+            get { return proto.Name; }
+        }
+
+        /// <summary>
+        /// The package as declared in the .proto file. This may or may not
+        /// be equivalent to the .NET namespace of the generated classes.
+        /// </summary>
+        public string Package
+        {
+            get { return proto.Package; }
+        }
+
+        /// <value>
+        /// Unmodifiable list of top-level message types declared in this file.
+        /// </value>
+        public IList<MessageDescriptor> MessageTypes
+        {
+            get { return messageTypes; }
+        }
+
+        /// <value>
+        /// Unmodifiable list of top-level enum types declared in this file.
+        /// </value>
+        public IList<EnumDescriptor> EnumTypes
+        {
+            get { return enumTypes; }
+        }
+
+        /// <value>
+        /// Unmodifiable list of top-level services declared in this file.
+        /// </value>
+        public IList<ServiceDescriptor> Services
+        {
+            get { return services; }
+        }
+
+        /// <value>
+        /// Unmodifiable list of this file's dependencies (imports).
+        /// </value>
+        public IList<FileDescriptor> Dependencies
+        {
+            get { return dependencies; }
+        }
+
+        /// <value>
+        /// Unmodifiable list of this file's public dependencies (public imports).
+        /// </value>
+        public IList<FileDescriptor> PublicDependencies
+        {
+            get { return publicDependencies; }
+        }
+
+        /// <value>
+        /// Implementation of IDescriptor.FullName - just returns the same as Name.
+        /// </value>
+        string IDescriptor.FullName
+        {
+            get { return Name; }
+        }
+
+        /// <value>
+        /// Implementation of IDescriptor.File - just returns this descriptor.
+        /// </value>
+        FileDescriptor IDescriptor.File
+        {
+            get { return this; }
+        }
+
+        /// <value>
+        /// Pool containing symbol descriptors.
+        /// </value>
+        internal DescriptorPool DescriptorPool
+        {
+            get { return pool; }
+        }
+
+        /// <summary>
+        /// Finds a type (message, enum, service or extension) in the file by name. Does not find nested types.
+        /// </summary>
+        /// <param name="name">The unqualified type name to look for.</param>
+        /// <typeparam name="T">The type of descriptor to look for (or ITypeDescriptor for any)</typeparam>
+        /// <returns>The type's descriptor, or null if not found.</returns>
+        public T FindTypeByName<T>(String name)
+            where T : class, IDescriptor
+        {
+            // Don't allow looking up nested types.  This will make optimization
+            // easier later.
+            if (name.IndexOf('.') != -1)
+            {
+                return null;
+            }
+            if (Package.Length > 0)
+            {
+                name = Package + "." + name;
+            }
+            T result = pool.FindSymbol<T>(name);
+            if (result != null && result.File == this)
+            {
+                return result;
+            }
+            return null;
+        }
+        
+        /// <summary>
+        /// Builds a FileDescriptor from its protocol buffer representation.
+        /// </summary>
+        /// <param name="proto">The protocol message form of the FileDescriptor.</param>
+        /// <param name="dependencies">FileDescriptors corresponding to all of the
+        /// file's dependencies, in the exact order listed in the .proto file. May be null,
+        /// in which case it is treated as an empty array.</param>
+        /// <param name="allowUnknownDependencies">Whether unknown dependencies are ignored (true) or cause an exception to be thrown (false).</param>
+        /// <exception cref="DescriptorValidationException">If <paramref name="proto"/> is not
+        /// a valid descriptor. This can occur for a number of reasons, such as a field
+        /// having an undefined type or because two messages were defined with the same name.</exception>
+        private static FileDescriptor BuildFrom(FileDescriptorProto proto, FileDescriptor[] dependencies, bool allowUnknownDependencies)
+        {
+            // Building descriptors involves two steps: translating and linking.
+            // In the translation step (implemented by FileDescriptor's
+            // constructor), we build an object tree mirroring the
+            // FileDescriptorProto's tree and put all of the descriptors into the
+            // DescriptorPool's lookup tables.  In the linking step, we look up all
+            // type references in the DescriptorPool, so that, for example, a
+            // FieldDescriptor for an embedded message contains a pointer directly
+            // to the Descriptor for that message's type.  We also detect undefined
+            // types in the linking step.
+            if (dependencies == null)
+            {
+                dependencies = new FileDescriptor[0];
+            }
+
+            DescriptorPool pool = new DescriptorPool(dependencies);
+            FileDescriptor result = new FileDescriptor(proto, dependencies, pool, allowUnknownDependencies);
+
+            // TODO(jonskeet): Reinstate these checks, or get rid of them entirely. They aren't in the Java code,
+            // and fail for the CustomOptions test right now. (We get "descriptor.proto" vs "google/protobuf/descriptor.proto".)
+            //if (dependencies.Length != proto.DependencyCount)
+            //{
+            //    throw new DescriptorValidationException(result,
+            //                                            "Dependencies passed to FileDescriptor.BuildFrom() don't match " +
+            //                                            "those listed in the FileDescriptorProto.");
+            //}
+            //for (int i = 0; i < proto.DependencyCount; i++)
+            //{
+            //    if (dependencies[i].Name != proto.DependencyList[i])
+            //    {
+            //        throw new DescriptorValidationException(result,
+            //                                                "Dependencies passed to FileDescriptor.BuildFrom() don't match " +
+            //                                                "those listed in the FileDescriptorProto.");
+            //    }
+            //}
+
+            result.CrossLink();
+            return result;
+        }
+
+        private void CrossLink()
+        {
+            foreach (MessageDescriptor message in messageTypes)
+            {
+                message.CrossLink();
+            }
+
+            foreach (ServiceDescriptor service in services)
+            {
+                service.CrossLink();
+            }
+        }
+
+        public static FileDescriptor InternalBuildGeneratedFileFrom(byte[] descriptorData,
+                                                                    FileDescriptor[] dependencies)
+        {
+            FileDescriptorProto proto;
+            try
+            {
+                proto = FileDescriptorProto.Parser.ParseFrom(descriptorData);
+            }
+            catch (InvalidProtocolBufferException e)
+            {
+                throw new ArgumentException("Failed to parse protocol buffer descriptor for generated code.", e);
+            }
+
+            try
+            {
+                // When building descriptors for generated code, we allow unknown
+                // dependencies by default.
+                return BuildFrom(proto, dependencies, true);
+            }
+            catch (DescriptorValidationException e)
+            {
+                throw new ArgumentException("Invalid embedded descriptor for \"" + proto.Name + "\".", e);
+            }
+        }
+        
+        public override string ToString()
+        {
+            return "FileDescriptor for " + proto.Name;
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/IDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/IDescriptor.cs
index 92c6d463..6506db1b 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/IDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/IDescriptor.cs
@@ -1,44 +1,44 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Interface implemented by all descriptor types.
-    /// </summary>
-    public interface IDescriptor
-    {
-        string Name { get; }
-        string FullName { get; }
-        FileDescriptor File { get; }
-    }    
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Interface implemented by all descriptor types.
+    /// </summary>
+    public interface IDescriptor
+    {
+        string Name { get; }
+        string FullName { get; }
+        FileDescriptor File { get; }
+    }    
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/IFieldAccessor.cs b/csharp/src/ProtocolBuffers/Reflection/IFieldAccessor.cs
index d1727cb4..b631d34f 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/IFieldAccessor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/IFieldAccessor.cs
@@ -1,72 +1,70 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using Google.Protobuf.Descriptors;
-
-namespace Google.Protobuf.FieldAccess
-{
-    /// <summary>
-    /// Allows fields to be reflectively accessed.
-    /// </summary>
-    public interface IFieldAccessor
-    {
-        /// <summary>
-        /// Returns the descriptor associated with this field.
-        /// </summary>
-        FieldDescriptor Descriptor { get; }
-
-        // TODO: Should the argument type for these messages by IReflectedMessage?
-
-        /// <summary>
-        /// Clears the field in the specified message. (For repeated fields,
-        /// this clears the list.)
-        /// </summary>
-        void Clear(object message);
-
-        /// <summary>
-        /// Fetches the field value. For repeated values, this will be an
-        /// <see cref="IList"/> implementation. For map values, this will be an
-        /// <see cref="IDictionary"/> implementation.
-        /// </summary>
-        object GetValue(object message);
-
-        /// <summary>
-        /// Mutator for single "simple" fields only.
-        /// </summary>
-        /// <remarks>
-        /// Repeated fields are mutated by fetching the value and manipulating it as a list.
-        /// Map fields are mutated by fetching the value and manipulating it as a dictionary.
-        /// </remarks>
-        /// <exception cref="InvalidOperationException">The field is not a "simple" field, or the message is frozen.</exception>
-        void SetValue(object message, object value);
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Allows fields to be reflectively accessed.
+    /// </summary>
+    public interface IFieldAccessor
+    {
+        /// <summary>
+        /// Returns the descriptor associated with this field.
+        /// </summary>
+        FieldDescriptor Descriptor { get; }
+
+        // TODO: Should the argument type for these messages by IReflectedMessage?
+
+        /// <summary>
+        /// Clears the field in the specified message. (For repeated fields,
+        /// this clears the list.)
+        /// </summary>
+        void Clear(object message);
+
+        /// <summary>
+        /// Fetches the field value. For repeated values, this will be an
+        /// <see cref="IList"/> implementation. For map values, this will be an
+        /// <see cref="IDictionary"/> implementation.
+        /// </summary>
+        object GetValue(object message);
+
+        /// <summary>
+        /// Mutator for single "simple" fields only.
+        /// </summary>
+        /// <remarks>
+        /// Repeated fields are mutated by fetching the value and manipulating it as a list.
+        /// Map fields are mutated by fetching the value and manipulating it as a dictionary.
+        /// </remarks>
+        /// <exception cref="InvalidOperationException">The field is not a "simple" field, or the message is frozen.</exception>
+        void SetValue(object message, object value);
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/MapFieldAccessor.cs b/csharp/src/ProtocolBuffers/Reflection/MapFieldAccessor.cs
index 100dbb37..317fbd8d 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/MapFieldAccessor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/MapFieldAccessor.cs
@@ -32,9 +32,8 @@
 
 using System;
 using System.Collections;
-using Google.Protobuf.Descriptors;
 
-namespace Google.Protobuf.FieldAccess
+namespace Google.Protobuf.Reflection
 {
     /// <summary>
     /// Accessor for map fields.
diff --git a/csharp/src/ProtocolBuffers/Descriptors/MessageDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/MessageDescriptor.cs
index e65e8bb0..2bb4fbed 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/MessageDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/MessageDescriptor.cs
@@ -1,173 +1,173 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Collections.Generic;
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Describes a message type.
-    /// </summary>
-    public sealed class MessageDescriptor : DescriptorBase
-    {
-        private readonly DescriptorProto proto;
-        private readonly MessageDescriptor containingType;
-        private readonly IList<MessageDescriptor> nestedTypes;
-        private readonly IList<EnumDescriptor> enumTypes;
-        private readonly IList<FieldDescriptor> fields;
-        private readonly IList<OneofDescriptor> oneofs;
-        
-        internal MessageDescriptor(DescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int typeIndex)
-            : base(file, file.ComputeFullName(parent, proto.Name), typeIndex)
-        {
-            this.proto = proto;
-            containingType = parent;
-
-            oneofs = DescriptorUtil.ConvertAndMakeReadOnly(proto.OneofDecl,
-                                                               (oneof, index) =>
-                                                               new OneofDescriptor(oneof, file, this, index));
-
-            nestedTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.NestedType,
-                                                                (type, index) =>
-                                                                new MessageDescriptor(type, file, this, index));
-
-            enumTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.EnumType,
-                                                              (type, index) =>
-                                                              new EnumDescriptor(type, file, this, index));
-
-            // TODO(jonskeet): Sort fields first?
-            fields = DescriptorUtil.ConvertAndMakeReadOnly(proto.Field,
-                                                           (field, index) =>
-                                                           new FieldDescriptor(field, file, this, index));
-            file.DescriptorPool.AddSymbol(this);
-        }
-
-        /// <summary>
-        /// The brief name of the descriptor's target.
-        /// </summary>
-        public override string Name { get { return proto.Name; } }
-
-        internal DescriptorProto Proto { get { return proto; } }
-
-        /// <value>
-        /// If this is a nested type, get the outer descriptor, otherwise null.
-        /// </value>
-        public MessageDescriptor ContainingType
-        {
-            get { return containingType; }
-        }
-
-        /// <value>
-        /// An unmodifiable list of this message type's fields.
-        /// </value>
-        public IList<FieldDescriptor> Fields
-        {
-            get { return fields; }
-        }
-
-        /// <value>
-        /// An unmodifiable list of this message type's nested types.
-        /// </value>
-        public IList<MessageDescriptor> NestedTypes
-        {
-            get { return nestedTypes; }
-        }
-
-        /// <value>
-        /// An unmodifiable list of this message type's enum types.
-        /// </value>
-        public IList<EnumDescriptor> EnumTypes
-        {
-            get { return enumTypes; }
-        }
-
-        public IList<OneofDescriptor> Oneofs
-        {
-            get { return oneofs; }
-        }
-
-        /// <summary>
-        /// Finds a field by field name.
-        /// </summary>
-        /// <param name="name">The unqualified name of the field (e.g. "foo").</param>
-        /// <returns>The field's descriptor, or null if not found.</returns>
-        public FieldDescriptor FindFieldByName(String name)
-        {
-            return File.DescriptorPool.FindSymbol<FieldDescriptor>(FullName + "." + name);
-        }
-
-        /// <summary>
-        /// Finds a field by field number.
-        /// </summary>
-        /// <param name="number">The field number within this message type.</param>
-        /// <returns>The field's descriptor, or null if not found.</returns>
-        public FieldDescriptor FindFieldByNumber(int number)
-        {
-            return File.DescriptorPool.FindFieldByNumber(this, number);
-        }
-
-        /// <summary>
-        /// Finds a nested descriptor by name. The is valid for fields, nested
-        /// message types, oneofs and enums.
-        /// </summary>
-        /// <param name="name">The unqualified name of the descriptor, e.g. "Foo"</param>
-        /// <returns>The descriptor, or null if not found.</returns>
-        public T FindDescriptor<T>(string name)
-            where T : class, IDescriptor
-        {
-            return File.DescriptorPool.FindSymbol<T>(FullName + "." + name);
-        }
-
-        /// <summary>
-        /// Looks up and cross-links all fields and nested types.
-        /// </summary>
-        internal void CrossLink()
-        {
-            foreach (MessageDescriptor message in nestedTypes)
-            {
-                message.CrossLink();
-            }
-
-            foreach (FieldDescriptor field in fields)
-            {
-                field.CrossLink();
-            }
-
-            foreach (OneofDescriptor oneof in oneofs)
-            {
-                oneof.CrossLink();
-            }
-        }        
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using Google.Protobuf.DescriptorProtos;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Describes a message type.
+    /// </summary>
+    public sealed class MessageDescriptor : DescriptorBase
+    {
+        private readonly DescriptorProto proto;
+        private readonly MessageDescriptor containingType;
+        private readonly IList<MessageDescriptor> nestedTypes;
+        private readonly IList<EnumDescriptor> enumTypes;
+        private readonly IList<FieldDescriptor> fields;
+        private readonly IList<OneofDescriptor> oneofs;
+        
+        internal MessageDescriptor(DescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int typeIndex)
+            : base(file, file.ComputeFullName(parent, proto.Name), typeIndex)
+        {
+            this.proto = proto;
+            containingType = parent;
+
+            oneofs = DescriptorUtil.ConvertAndMakeReadOnly(proto.OneofDecl,
+                                                               (oneof, index) =>
+                                                               new OneofDescriptor(oneof, file, this, index));
+
+            nestedTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.NestedType,
+                                                                (type, index) =>
+                                                                new MessageDescriptor(type, file, this, index));
+
+            enumTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.EnumType,
+                                                              (type, index) =>
+                                                              new EnumDescriptor(type, file, this, index));
+
+            // TODO(jonskeet): Sort fields first?
+            fields = DescriptorUtil.ConvertAndMakeReadOnly(proto.Field,
+                                                           (field, index) =>
+                                                           new FieldDescriptor(field, file, this, index));
+            file.DescriptorPool.AddSymbol(this);
+        }
+
+        /// <summary>
+        /// The brief name of the descriptor's target.
+        /// </summary>
+        public override string Name { get { return proto.Name; } }
+
+        internal DescriptorProto Proto { get { return proto; } }
+
+        /// <value>
+        /// If this is a nested type, get the outer descriptor, otherwise null.
+        /// </value>
+        public MessageDescriptor ContainingType
+        {
+            get { return containingType; }
+        }
+
+        /// <value>
+        /// An unmodifiable list of this message type's fields.
+        /// </value>
+        public IList<FieldDescriptor> Fields
+        {
+            get { return fields; }
+        }
+
+        /// <value>
+        /// An unmodifiable list of this message type's nested types.
+        /// </value>
+        public IList<MessageDescriptor> NestedTypes
+        {
+            get { return nestedTypes; }
+        }
+
+        /// <value>
+        /// An unmodifiable list of this message type's enum types.
+        /// </value>
+        public IList<EnumDescriptor> EnumTypes
+        {
+            get { return enumTypes; }
+        }
+
+        public IList<OneofDescriptor> Oneofs
+        {
+            get { return oneofs; }
+        }
+
+        /// <summary>
+        /// Finds a field by field name.
+        /// </summary>
+        /// <param name="name">The unqualified name of the field (e.g. "foo").</param>
+        /// <returns>The field's descriptor, or null if not found.</returns>
+        public FieldDescriptor FindFieldByName(String name)
+        {
+            return File.DescriptorPool.FindSymbol<FieldDescriptor>(FullName + "." + name);
+        }
+
+        /// <summary>
+        /// Finds a field by field number.
+        /// </summary>
+        /// <param name="number">The field number within this message type.</param>
+        /// <returns>The field's descriptor, or null if not found.</returns>
+        public FieldDescriptor FindFieldByNumber(int number)
+        {
+            return File.DescriptorPool.FindFieldByNumber(this, number);
+        }
+
+        /// <summary>
+        /// Finds a nested descriptor by name. The is valid for fields, nested
+        /// message types, oneofs and enums.
+        /// </summary>
+        /// <param name="name">The unqualified name of the descriptor, e.g. "Foo"</param>
+        /// <returns>The descriptor, or null if not found.</returns>
+        public T FindDescriptor<T>(string name)
+            where T : class, IDescriptor
+        {
+            return File.DescriptorPool.FindSymbol<T>(FullName + "." + name);
+        }
+
+        /// <summary>
+        /// Looks up and cross-links all fields and nested types.
+        /// </summary>
+        internal void CrossLink()
+        {
+            foreach (MessageDescriptor message in nestedTypes)
+            {
+                message.CrossLink();
+            }
+
+            foreach (FieldDescriptor field in fields)
+            {
+                field.CrossLink();
+            }
+
+            foreach (OneofDescriptor oneof in oneofs)
+            {
+                oneof.CrossLink();
+            }
+        }        
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/Descriptors/MethodDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/MethodDescriptor.cs
index 7d4a6f4f..03aba5a1 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/MethodDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/MethodDescriptor.cs
@@ -1,95 +1,95 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Describes a single method in a service.
-    /// </summary>
-    public sealed class MethodDescriptor : DescriptorBase
-    {
-        private readonly MethodDescriptorProto proto;
-        private readonly ServiceDescriptor service;
-        private MessageDescriptor inputType;
-        private MessageDescriptor outputType;
-
-        /// <value>
-        /// The service this method belongs to.
-        /// </value>
-        public ServiceDescriptor Service { get { return service; } }
-
-        /// <value>
-        /// The method's input type.
-        /// </value>
-        public MessageDescriptor InputType { get { return inputType; } }
-
-        /// <value>
-        /// The method's input type.
-        /// </value>
-        public MessageDescriptor OutputType { get { return outputType; } }
-
-        internal MethodDescriptor(MethodDescriptorProto proto, FileDescriptor file,
-                                  ServiceDescriptor parent, int index)
-            : base(file, parent.FullName + "." + proto.Name, index)
-        {
-            this.proto = proto;
-            service = parent;
-            file.DescriptorPool.AddSymbol(this);
-        }
-
-        internal MethodDescriptorProto Proto { get { return proto; } }
-
-        /// <summary>
-        /// The brief name of the descriptor's target.
-        /// </summary>
-        public override string Name { get { return proto.Name; } }
-
-        internal void CrossLink()
-        {
-            IDescriptor lookup = File.DescriptorPool.LookupSymbol(Proto.InputType, this);
-            if (!(lookup is MessageDescriptor))
-            {
-                throw new DescriptorValidationException(this, "\"" + Proto.InputType + "\" is not a message type.");
-            }
-            inputType = (MessageDescriptor) lookup;
-
-            lookup = File.DescriptorPool.LookupSymbol(Proto.OutputType, this);
-            if (!(lookup is MessageDescriptor))
-            {
-                throw new DescriptorValidationException(this, "\"" + Proto.OutputType + "\" is not a message type.");
-            }
-            outputType = (MessageDescriptor) lookup;
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using Google.Protobuf.DescriptorProtos;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Describes a single method in a service.
+    /// </summary>
+    public sealed class MethodDescriptor : DescriptorBase
+    {
+        private readonly MethodDescriptorProto proto;
+        private readonly ServiceDescriptor service;
+        private MessageDescriptor inputType;
+        private MessageDescriptor outputType;
+
+        /// <value>
+        /// The service this method belongs to.
+        /// </value>
+        public ServiceDescriptor Service { get { return service; } }
+
+        /// <value>
+        /// The method's input type.
+        /// </value>
+        public MessageDescriptor InputType { get { return inputType; } }
+
+        /// <value>
+        /// The method's input type.
+        /// </value>
+        public MessageDescriptor OutputType { get { return outputType; } }
+
+        internal MethodDescriptor(MethodDescriptorProto proto, FileDescriptor file,
+                                  ServiceDescriptor parent, int index)
+            : base(file, parent.FullName + "." + proto.Name, index)
+        {
+            this.proto = proto;
+            service = parent;
+            file.DescriptorPool.AddSymbol(this);
+        }
+
+        internal MethodDescriptorProto Proto { get { return proto; } }
+
+        /// <summary>
+        /// The brief name of the descriptor's target.
+        /// </summary>
+        public override string Name { get { return proto.Name; } }
+
+        internal void CrossLink()
+        {
+            IDescriptor lookup = File.DescriptorPool.LookupSymbol(Proto.InputType, this);
+            if (!(lookup is MessageDescriptor))
+            {
+                throw new DescriptorValidationException(this, "\"" + Proto.InputType + "\" is not a message type.");
+            }
+            inputType = (MessageDescriptor) lookup;
+
+            lookup = File.DescriptorPool.LookupSymbol(Proto.OutputType, this);
+            if (!(lookup is MessageDescriptor))
+            {
+                throw new DescriptorValidationException(this, "\"" + Proto.OutputType + "\" is not a message type.");
+            }
+            outputType = (MessageDescriptor) lookup;
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs b/csharp/src/ProtocolBuffers/Reflection/OneofAccessor.cs
index 590b6309..7a11d36b 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/OneofAccessor.cs
@@ -1,86 +1,85 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using Google.Protobuf.Descriptors;
-using System;
-using System.Reflection;
-
-namespace Google.Protobuf.FieldAccess
-{
-    /// <summary>
-    /// Reflection access for a oneof, allowing clear and "get case" actions.
-    /// </summary>
-    public sealed class OneofAccessor
-    {
-        private readonly Func<object, int> caseDelegate;
-        private readonly Action<object> clearDelegate;
-        private OneofDescriptor descriptor;
-
-        internal OneofAccessor(Type type, string propertyName, OneofDescriptor descriptor) 
-        {
-            PropertyInfo property = type.GetProperty(propertyName + "Case");
-            if (property == null || !property.CanRead)
-            {
-                throw new ArgumentException("Not all required properties/methods available");
-            }
-            this.descriptor = descriptor;
-            caseDelegate = ReflectionUtil.CreateFuncObjectT<int>(property.GetGetMethod());
-
-            this.descriptor = descriptor;
-            MethodInfo clearMethod = type.GetMethod("Clear" + propertyName);
-            clearDelegate = ReflectionUtil.CreateActionObject(clearMethod);
-        }
-
-        public OneofDescriptor Descriptor { get { return descriptor; } }
-
-        /// <summary>
-        /// Clears the oneof in the specified message.
-        /// </summary>
-        public void Clear(object message)
-        {
-            clearDelegate(message);
-        }
-
-        /// <summary>
-        /// Indicates which field in the oneof is set for specified message
-        /// </summary>
-        public FieldDescriptor GetCaseFieldDescriptor(object message)
-        {
-            int fieldNumber = caseDelegate(message);
-            if (fieldNumber > 0)
-            {
-                return descriptor.ContainingType.FindFieldByNumber(fieldNumber);
-            }
-            return null;
-        }
-    }
-}
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Reflection;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Reflection access for a oneof, allowing clear and "get case" actions.
+    /// </summary>
+    public sealed class OneofAccessor
+    {
+        private readonly Func<object, int> caseDelegate;
+        private readonly Action<object> clearDelegate;
+        private OneofDescriptor descriptor;
+
+        internal OneofAccessor(Type type, string propertyName, OneofDescriptor descriptor) 
+        {
+            PropertyInfo property = type.GetProperty(propertyName + "Case");
+            if (property == null || !property.CanRead)
+            {
+                throw new ArgumentException("Not all required properties/methods available");
+            }
+            this.descriptor = descriptor;
+            caseDelegate = ReflectionUtil.CreateFuncObjectT<int>(property.GetGetMethod());
+
+            this.descriptor = descriptor;
+            MethodInfo clearMethod = type.GetMethod("Clear" + propertyName);
+            clearDelegate = ReflectionUtil.CreateActionObject(clearMethod);
+        }
+
+        public OneofDescriptor Descriptor { get { return descriptor; } }
+
+        /// <summary>
+        /// Clears the oneof in the specified message.
+        /// </summary>
+        public void Clear(object message)
+        {
+            clearDelegate(message);
+        }
+
+        /// <summary>
+        /// Indicates which field in the oneof is set for specified message
+        /// </summary>
+        public FieldDescriptor GetCaseFieldDescriptor(object message)
+        {
+            int fieldNumber = caseDelegate(message);
+            if (fieldNumber > 0)
+            {
+                return descriptor.ContainingType.FindFieldByNumber(fieldNumber);
+            }
+            return null;
+        }
+    }
+}
diff --git a/csharp/src/ProtocolBuffers/Descriptors/OneofDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/OneofDescriptor.cs
index 8418948f..94033c7e 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/OneofDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/OneofDescriptor.cs
@@ -1,79 +1,79 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    public sealed class OneofDescriptor : DescriptorBase
-    {
-        private readonly OneofDescriptorProto proto;
-        private MessageDescriptor containingType;
-        private IList<FieldDescriptor> fields;
-
-        internal OneofDescriptor(OneofDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index)
-            : base(file, file.ComputeFullName(parent, proto.Name), index)
-        {
-            this.proto = proto;
-            containingType = parent;
-
-            file.DescriptorPool.AddSymbol(this);
-        }
-
-        /// <summary>
-        /// The brief name of the descriptor's target.
-        /// </summary>
-        public override string Name { get { return proto.Name; } }
-
-        public MessageDescriptor ContainingType
-        {
-            get { return containingType; }
-        }
-
-        public IList<FieldDescriptor> Fields { get { return fields; } }
-
-        internal void CrossLink()
-        {
-            List<FieldDescriptor> fieldCollection = new List<FieldDescriptor>();
-            foreach (var field in ContainingType.Fields)
-            {
-                if (field.ContainingOneof == this)
-                {
-                    fieldCollection.Add(field);
-                }
-            }
-            fields = new ReadOnlyCollection<FieldDescriptor>(fieldCollection);
-        }
-    }
-}
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Google.Protobuf.DescriptorProtos;
+
+namespace Google.Protobuf.Reflection
+{
+    public sealed class OneofDescriptor : DescriptorBase
+    {
+        private readonly OneofDescriptorProto proto;
+        private MessageDescriptor containingType;
+        private IList<FieldDescriptor> fields;
+
+        internal OneofDescriptor(OneofDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index)
+            : base(file, file.ComputeFullName(parent, proto.Name), index)
+        {
+            this.proto = proto;
+            containingType = parent;
+
+            file.DescriptorPool.AddSymbol(this);
+        }
+
+        /// <summary>
+        /// The brief name of the descriptor's target.
+        /// </summary>
+        public override string Name { get { return proto.Name; } }
+
+        public MessageDescriptor ContainingType
+        {
+            get { return containingType; }
+        }
+
+        public IList<FieldDescriptor> Fields { get { return fields; } }
+
+        internal void CrossLink()
+        {
+            List<FieldDescriptor> fieldCollection = new List<FieldDescriptor>();
+            foreach (var field in ContainingType.Fields)
+            {
+                if (field.ContainingOneof == this)
+                {
+                    fieldCollection.Add(field);
+                }
+            }
+            fields = new ReadOnlyCollection<FieldDescriptor>(fieldCollection);
+        }
+    }
+}
diff --git a/csharp/src/ProtocolBuffers/Descriptors/PackageDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/PackageDescriptor.cs
index 18adc9e3..e547d834 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/PackageDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/PackageDescriptor.cs
@@ -1,68 +1,68 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Represents a package in the symbol table.  We use PackageDescriptors
-    /// just as placeholders so that someone cannot define, say, a message type
-    /// that has the same name as an existing package.
-    /// </summary>
-    internal sealed class PackageDescriptor : IDescriptor
-    {
-        private readonly string name;
-        private readonly string fullName;
-        private readonly FileDescriptor file;
-
-        internal PackageDescriptor(string name, string fullName, FileDescriptor file)
-        {
-            this.file = file;
-            this.fullName = fullName;
-            this.name = name;
-        }
-
-        public string Name
-        {
-            get { return name; }
-        }
-
-        public string FullName
-        {
-            get { return fullName; }
-        }
-
-        public FileDescriptor File
-        {
-            get { return file; }
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Represents a package in the symbol table.  We use PackageDescriptors
+    /// just as placeholders so that someone cannot define, say, a message type
+    /// that has the same name as an existing package.
+    /// </summary>
+    internal sealed class PackageDescriptor : IDescriptor
+    {
+        private readonly string name;
+        private readonly string fullName;
+        private readonly FileDescriptor file;
+
+        internal PackageDescriptor(string name, string fullName, FileDescriptor file)
+        {
+            this.file = file;
+            this.fullName = fullName;
+            this.name = name;
+        }
+
+        public string Name
+        {
+            get { return name; }
+        }
+
+        public string FullName
+        {
+            get { return fullName; }
+        }
+
+        public FileDescriptor File
+        {
+            get { return file; }
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/ReflectionUtil.cs b/csharp/src/ProtocolBuffers/Reflection/ReflectionUtil.cs
index 08ef6c0c..d0dc3e8b 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/ReflectionUtil.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/ReflectionUtil.cs
@@ -1,106 +1,106 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Linq.Expressions;
-using System.Reflection;
-
-namespace Google.Protobuf.FieldAccess
-{
-    /// <summary>
-    /// The methods in this class are somewhat evil, and should not be tampered with lightly.
-    /// Basically they allow the creation of relatively weakly typed delegates from MethodInfos
-    /// which are more strongly typed. They do this by creating an appropriate strongly typed
-    /// delegate from the MethodInfo, and then calling that within an anonymous method.
-    /// Mind-bending stuff (at least to your humble narrator) but the resulting delegates are
-    /// very fast compared with calling Invoke later on.
-    /// </summary>
-    internal static class ReflectionUtil
-    {
-        /// <summary>
-        /// Empty Type[] used when calling GetProperty to force property instead of indexer fetching.
-        /// </summary>
-        internal static readonly Type[] EmptyTypes = new Type[0];
-
-        /// <summary>
-        /// Creates a delegate which will cast the argument to the appropriate method target type,
-        /// call the method on it, then convert the result to object.
-        /// </summary>
-        internal static Func<object, object> CreateFuncObjectObject(MethodInfo method)
-        {
-            ParameterExpression parameter = Expression.Parameter(typeof(object), "p");
-            Expression downcast = Expression.Convert(parameter, method.DeclaringType);
-            Expression call = Expression.Call(downcast, method);
-            Expression upcast = Expression.Convert(call, typeof(object));
-            return Expression.Lambda<Func<object, object>>(upcast, parameter).Compile();
-        }
-
-        /// <summary>
-        /// Creates a delegate which will cast the argument to the appropriate method target type,
-        /// call the method on it, then convert the result to the specified type.
-        /// </summary>
-        internal static Func<object, T> CreateFuncObjectT<T>(MethodInfo method)
-        {
-            ParameterExpression parameter = Expression.Parameter(typeof(object), "p");
-            Expression downcast = Expression.Convert(parameter, method.DeclaringType);
-            Expression call = Expression.Call(downcast, method);
-            Expression upcast = Expression.Convert(call, typeof(T));
-            return Expression.Lambda<Func<object, T>>(upcast, parameter).Compile();
-        }
-
-        /// <summary>
-        /// Creates a delegate which will execute the given method after casting the first argument to
-        /// the target type of the method, and the second argument to the first parameter type of the method.
-        /// </summary>
-        internal static Action<object, object> CreateActionObjectObject(MethodInfo method)
-        {
-            ParameterExpression targetParameter = Expression.Parameter(typeof(object), "target");
-            ParameterExpression argParameter = Expression.Parameter(typeof(object), "arg");
-            Expression castTarget = Expression.Convert(targetParameter, method.DeclaringType);
-            Expression castArgument = Expression.Convert(argParameter, method.GetParameters()[0].ParameterType);
-            Expression call = Expression.Call(castTarget, method, castArgument);
-            return Expression.Lambda<Action<object, object>>(call, targetParameter, argParameter).Compile();
-        }
-
-        /// <summary>
-        /// Creates a delegate which will execute the given method after casting the first argument to
-        /// the target type of the method.
-        /// </summary>
-        internal static Action<object> CreateActionObject(MethodInfo method)
-        {
-            ParameterExpression targetParameter = Expression.Parameter(typeof(object), "target");
-            Expression castTarget = Expression.Convert(targetParameter, method.DeclaringType);
-            Expression call = Expression.Call(castTarget, method);
-            return Expression.Lambda<Action<object>>(call, targetParameter).Compile();
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Linq.Expressions;
+using System.Reflection;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// The methods in this class are somewhat evil, and should not be tampered with lightly.
+    /// Basically they allow the creation of relatively weakly typed delegates from MethodInfos
+    /// which are more strongly typed. They do this by creating an appropriate strongly typed
+    /// delegate from the MethodInfo, and then calling that within an anonymous method.
+    /// Mind-bending stuff (at least to your humble narrator) but the resulting delegates are
+    /// very fast compared with calling Invoke later on.
+    /// </summary>
+    internal static class ReflectionUtil
+    {
+        /// <summary>
+        /// Empty Type[] used when calling GetProperty to force property instead of indexer fetching.
+        /// </summary>
+        internal static readonly Type[] EmptyTypes = new Type[0];
+
+        /// <summary>
+        /// Creates a delegate which will cast the argument to the appropriate method target type,
+        /// call the method on it, then convert the result to object.
+        /// </summary>
+        internal static Func<object, object> CreateFuncObjectObject(MethodInfo method)
+        {
+            ParameterExpression parameter = Expression.Parameter(typeof(object), "p");
+            Expression downcast = Expression.Convert(parameter, method.DeclaringType);
+            Expression call = Expression.Call(downcast, method);
+            Expression upcast = Expression.Convert(call, typeof(object));
+            return Expression.Lambda<Func<object, object>>(upcast, parameter).Compile();
+        }
+
+        /// <summary>
+        /// Creates a delegate which will cast the argument to the appropriate method target type,
+        /// call the method on it, then convert the result to the specified type.
+        /// </summary>
+        internal static Func<object, T> CreateFuncObjectT<T>(MethodInfo method)
+        {
+            ParameterExpression parameter = Expression.Parameter(typeof(object), "p");
+            Expression downcast = Expression.Convert(parameter, method.DeclaringType);
+            Expression call = Expression.Call(downcast, method);
+            Expression upcast = Expression.Convert(call, typeof(T));
+            return Expression.Lambda<Func<object, T>>(upcast, parameter).Compile();
+        }
+
+        /// <summary>
+        /// Creates a delegate which will execute the given method after casting the first argument to
+        /// the target type of the method, and the second argument to the first parameter type of the method.
+        /// </summary>
+        internal static Action<object, object> CreateActionObjectObject(MethodInfo method)
+        {
+            ParameterExpression targetParameter = Expression.Parameter(typeof(object), "target");
+            ParameterExpression argParameter = Expression.Parameter(typeof(object), "arg");
+            Expression castTarget = Expression.Convert(targetParameter, method.DeclaringType);
+            Expression castArgument = Expression.Convert(argParameter, method.GetParameters()[0].ParameterType);
+            Expression call = Expression.Call(castTarget, method, castArgument);
+            return Expression.Lambda<Action<object, object>>(call, targetParameter, argParameter).Compile();
+        }
+
+        /// <summary>
+        /// Creates a delegate which will execute the given method after casting the first argument to
+        /// the target type of the method.
+        /// </summary>
+        internal static Action<object> CreateActionObject(MethodInfo method)
+        {
+            ParameterExpression targetParameter = Expression.Parameter(typeof(object), "target");
+            Expression castTarget = Expression.Convert(targetParameter, method.DeclaringType);
+            Expression call = Expression.Call(castTarget, method);
+            return Expression.Lambda<Action<object>>(call, targetParameter).Compile();
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/RepeatedFieldAccessor.cs b/csharp/src/ProtocolBuffers/Reflection/RepeatedFieldAccessor.cs
index 8d7ecbaf..0ada7567 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/RepeatedFieldAccessor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/RepeatedFieldAccessor.cs
@@ -32,9 +32,8 @@
 
 using System;
 using System.Collections;
-using Google.Protobuf.Descriptors;
 
-namespace Google.Protobuf.FieldAccess
+namespace Google.Protobuf.Reflection
 {
     /// <summary>
     /// Accessor for repeated fields.
diff --git a/csharp/src/ProtocolBuffers/Descriptors/ServiceDescriptor.cs b/csharp/src/ProtocolBuffers/Reflection/ServiceDescriptor.cs
index 2556e272..75925eb3 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/ServiceDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/ServiceDescriptor.cs
@@ -1,90 +1,90 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Collections.Generic;
-using Google.Protobuf.DescriptorProtos;
-
-namespace Google.Protobuf.Descriptors
-{
-    /// <summary>
-    /// Describes a service type.
-    /// </summary>
-    public sealed class ServiceDescriptor : DescriptorBase
-    {
-        private readonly ServiceDescriptorProto proto;
-        private readonly IList<MethodDescriptor> methods;
-
-        internal ServiceDescriptor(ServiceDescriptorProto proto, FileDescriptor file, int index)
-            : base(file, file.ComputeFullName(null, proto.Name), index)
-        {
-            this.proto = proto;
-            methods = DescriptorUtil.ConvertAndMakeReadOnly(proto.Method,
-                                                            (method, i) => new MethodDescriptor(method, file, this, i));
-
-            file.DescriptorPool.AddSymbol(this);
-        }
-
-        /// <summary>
-        /// The brief name of the descriptor's target.
-        /// </summary>
-        public override string Name { get { return proto.Name; } }
-
-        internal ServiceDescriptorProto Proto { get { return proto; } }
-
-        /// <value>
-        /// An unmodifiable list of methods in this service.
-        /// </value>
-        public IList<MethodDescriptor> Methods
-        {
-            get { return methods; }
-        }
-
-        /// <summary>
-        /// Finds a method by name.
-        /// </summary>
-        /// <param name="name">The unqualified name of the method (e.g. "Foo").</param>
-        /// <returns>The method's decsriptor, or null if not found.</returns>
-        public MethodDescriptor FindMethodByName(String name)
-        {
-            return File.DescriptorPool.FindSymbol<MethodDescriptor>(FullName + "." + name);
-        }
-
-        internal void CrossLink()
-        {
-            foreach (MethodDescriptor method in methods)
-            {
-                method.CrossLink();
-            }
-        }
-    }
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using Google.Protobuf.DescriptorProtos;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Describes a service type.
+    /// </summary>
+    public sealed class ServiceDescriptor : DescriptorBase
+    {
+        private readonly ServiceDescriptorProto proto;
+        private readonly IList<MethodDescriptor> methods;
+
+        internal ServiceDescriptor(ServiceDescriptorProto proto, FileDescriptor file, int index)
+            : base(file, file.ComputeFullName(null, proto.Name), index)
+        {
+            this.proto = proto;
+            methods = DescriptorUtil.ConvertAndMakeReadOnly(proto.Method,
+                                                            (method, i) => new MethodDescriptor(method, file, this, i));
+
+            file.DescriptorPool.AddSymbol(this);
+        }
+
+        /// <summary>
+        /// The brief name of the descriptor's target.
+        /// </summary>
+        public override string Name { get { return proto.Name; } }
+
+        internal ServiceDescriptorProto Proto { get { return proto; } }
+
+        /// <value>
+        /// An unmodifiable list of methods in this service.
+        /// </value>
+        public IList<MethodDescriptor> Methods
+        {
+            get { return methods; }
+        }
+
+        /// <summary>
+        /// Finds a method by name.
+        /// </summary>
+        /// <param name="name">The unqualified name of the method (e.g. "Foo").</param>
+        /// <returns>The method's decsriptor, or null if not found.</returns>
+        public MethodDescriptor FindMethodByName(String name)
+        {
+            return File.DescriptorPool.FindSymbol<MethodDescriptor>(FullName + "." + name);
+        }
+
+        internal void CrossLink()
+        {
+            foreach (MethodDescriptor method in methods)
+            {
+                method.CrossLink();
+            }
+        }
+    }
 }
 \ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/SingleFieldAccessor.cs b/csharp/src/ProtocolBuffers/Reflection/SingleFieldAccessor.cs
index cdc89e8d..8c24e46e 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/SingleFieldAccessor.cs
+++ b/csharp/src/ProtocolBuffers/Reflection/SingleFieldAccessor.cs
@@ -29,12 +29,11 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
-    
+
 using System;
 using System.Reflection;
-using Google.Protobuf.Descriptors;
 
-namespace Google.Protobuf.FieldAccess
+namespace Google.Protobuf.Reflection
 {
     /// <summary>
     /// Accessor for single fields.
diff --git a/csharp/src/ProtocolBuffers/WireFormat.cs b/csharp/src/ProtocolBuffers/WireFormat.cs
index 7489c2fc..c1712daa 100644
--- a/csharp/src/ProtocolBuffers/WireFormat.cs
+++ b/csharp/src/ProtocolBuffers/WireFormat.cs
@@ -31,7 +31,7 @@
 #endregion
 
 using System;
-using Google.Protobuf.Descriptors;
+using Google.Protobuf.Reflection;
 
 namespace Google.Protobuf
 {
diff --git a/src/google/protobuf/compiler/csharp/csharp_message.cc b/src/google/protobuf/compiler/csharp/csharp_message.cc
index 3fbec2b5..7cbba911 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_message.cc
@@ -116,7 +116,7 @@ void MessageGenerator::GenerateStaticVariables(io::Printer* printer) {
 
   // The descriptor for this type.
   printer->Print(
-      "internal static pb::FieldAccess.FieldAccessorTable internal__$identifier$__FieldAccessorTable;\n",
+      "internal static pbr::FieldAccessorTable internal__$identifier$__FieldAccessorTable;\n",
       "identifier", GetUniqueFileScopeIdentifier(descriptor_),
       "full_class_name", full_class_name());
 
@@ -145,7 +145,7 @@ void MessageGenerator::GenerateStaticVariableInitializers(io::Printer* printer)
   printer->Print(
     vars,
     "internal__$identifier$__FieldAccessorTable = \n"
-    "    new pb::FieldAccess.FieldAccessorTable(typeof($full_class_name$), $descriptor_chain$,\n");
+    "    new pbr::FieldAccessorTable(typeof($full_class_name$), $descriptor_chain$,\n");
   printer->Print("        new string[] { ");
   for (int i = 0; i < descriptor_->field_count(); i++) {
     printer->Print("\"$property_name$\", ",
@@ -211,11 +211,11 @@ void MessageGenerator::Generate(io::Printer* printer) {
 
   printer->Print(
     vars,
-    "public static pbd::MessageDescriptor Descriptor {\n"
+    "public static pbr::MessageDescriptor Descriptor {\n"
     "  get { return $descriptor_accessor$; }\n"
     "}\n"
     "\n"
-    "public pb::FieldAccess.FieldAccessorTable Fields {\n"
+    "public pbr::FieldAccessorTable Fields {\n"
     "  get { return $umbrella_class_name$.internal__$identifier$__FieldAccessorTable; }\n"
     "}\n"
     "\n"
diff --git a/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc b/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc
index 8fbd3e9a..b75c68a1 100644
--- a/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc
@@ -119,7 +119,7 @@ void UmbrellaClassGenerator::WriteIntroduction(io::Printer* printer) {
     "\n"
     "using pb = global::Google.Protobuf;\n"
     "using pbc = global::Google.Protobuf.Collections;\n"
-    "using pbd = global::Google.Protobuf.Descriptors;\n"
+    "using pbr = global::Google.Protobuf.Reflection;\n"
     "using scg = global::System.Collections.Generic;\n",
     "file_name", file_->name());
 
@@ -151,10 +151,10 @@ void UmbrellaClassGenerator::WriteIntroduction(io::Printer* printer) {
 void UmbrellaClassGenerator::WriteDescriptor(io::Printer* printer) {
   printer->Print(
     "#region Descriptor\n"
-    "public static pbd::FileDescriptor Descriptor {\n"
+    "public static pbr::FileDescriptor Descriptor {\n"
     "  get { return descriptor; }\n"
     "}\n"
-    "private static pbd::FileDescriptor descriptor;\n"
+    "private static pbr::FileDescriptor descriptor;\n"
     "\n"
     "static $umbrella_class_name$() {\n",
     "umbrella_class_name", umbrellaClassname_);
@@ -180,8 +180,8 @@ void UmbrellaClassGenerator::WriteDescriptor(io::Printer* printer) {
   // -----------------------------------------------------------------
   // Invoke InternalBuildGeneratedFileFrom() to build the file.
   printer->Print(
-      "descriptor = pbd::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,\n");
-  printer->Print("    new pbd::FileDescriptor[] {\n");
+      "descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,\n");
+  printer->Print("    new pbr::FileDescriptor[] {\n");
   for (int i = 0; i < file_->dependency_count(); i++) {
     printer->Print(
       "    $full_umbrella_class_name$.Descriptor, \n",