github markdown: code blocks

1 files changed, 12 insertions, 12 deletions

diff --git a/12-xml-expressions-and-patterns.md b/12-xml-expressions-and-patterns.md
index 4d4ed87169..974fbc6b78 100644
--- a/12-xml-expressions-and-patterns.md
+++ b/12-xml-expressions-and-patterns.md
@@ -12,9 +12,9 @@ XML expressions are expressions generated by the following production, where the
 opening bracket `<' of the first element must be in a position to start the lexical
 [XML mode](#xml-mode).
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+``` 
 XmlExpr ::= XmlContent {Element}
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+```
 
 Well-formedness constraints of the XML specification apply, which
 means for instance that start tags and end tags must match, and
@@ -28,7 +28,7 @@ are changed. Scala does not support declarations, CDATA
 sections or processing instructions. Entity references are not
 resolved at runtime.
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+``` 
 Element       ::=    EmptyElemTag
                 |    STag Content ETag                                       
 
@@ -44,7 +44,7 @@ XmlContent    ::=    Element
                 |    CDSect
                 |    PI
                 |    Comment
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+``` 
 
 If an XML expression is a single element, its value is a runtime
 representation of an XML node (an instance of a subclass of 
@@ -62,7 +62,7 @@ and consecutive occurrences of whitespace are replaced by a single space
 character \\u0020. This behavior can be changed to preserve all whitespace
 with a compiler option.
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+``` 
 Attribute  ::=    Name Eq AttValue                                    
 
 AttValue      ::=    ‘"’ {CharQ | CharRef} ‘"’
@@ -73,7 +73,7 @@ ScalaExpr     ::=    Block
 
 CharData      ::=   { CharNoRef } $\mbox{\rm\em without}$ {CharNoRef}`{'CharB {CharNoRef} 
                                   $\mbox{\rm\em and without}$ {CharNoRef}`]]>'{CharNoRef}
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+```
 
 XML expressions may contain Scala expressions as attribute values or
 within nodes. In the latter case, these are embedded using a single opening 
@@ -82,7 +82,7 @@ within XML text as generated by CharData, it must be doubled. Thus, ‘{{’
 represents the XML text ‘{’ and does not introduce an embedded Scala
 expression.
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+``` 
 BaseChar, Char, Comment, CombiningChar, Ideographic, NameChar, S, Reference
               ::=  $\mbox{\rm\em “as in W3C XML”}$
 
@@ -96,7 +96,7 @@ Name          ::=  XNameStart {NameChar}
 XNameStart    ::= ‘_’ | BaseChar | Ideographic 
                  $\mbox{\rm\em (as in W3C XML, but without }$ ‘:’
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+```
 
 ## XML patterns
 
@@ -104,9 +104,9 @@ XML patterns are patterns generated by the following production, where
 the opening bracket ‘<’ of the element patterns must be in a position
 to start the lexical [XML mode](#xml-mode).
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+``` 
 XmlPattern  ::= ElementPattern 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+```
 
 Well-formedness constraints of the XML specification apply.
 
@@ -126,7 +126,7 @@ and consecutive occurrences of whitespace are replaced by a single space
 character \\u0020. This behavior can be changed to preserve all whitespace
 with a compiler option.
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+``` 
 ElemPattern   ::=    EmptyElemTagP
                 |    STagP ContentP ETagP                                    
 
@@ -141,5 +141,5 @@ ContentP1     ::=    ElemPattern
                 |    Comment
                 |    ScalaPatterns
 ScalaPatterns ::=    ‘{’ Patterns ‘}’
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+```