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xpath(xml, xpath) - Returns a string array of values within xml nodes that match the xpath expression
Example:
> SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>', 'a/text()') FROM src LIMIT 1
[]
> SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>', 'a/b/text()') FROM src LIMIT 1
["b1","b2","b3"]
> SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>', 'a/c/text()') FROM src LIMIT 1
["c1","c2"]
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