xml.result, xml.test:
  Adding test case.
item_xmlfunc.cc:
  Fixed that Item_nodeset_func derived classes
  didn't take into account charset of the XML value
  and always worked using "binary" charset.


sql/item_xmlfunc.cc:
  Bug#16316: XML: extractvalue() is case-sensitive with contains()
  Fixed that Item_nodeset_func derived classes
  didn't take into account charset of the XML value
  and always worked using "binary" charset.
mysql-test/t/xml.test:
  Adding test case.
mysql-test/r/xml.result:
  Adding test case.