Example: The QNames specified by "cdata-section-elements" are not checked for being valid QNames; in xsltParseStylesheetOutput() only xsltGetQNameURI() is called, which does not catch the following cases:
1) ":"
2) "foo:bar:boo"

Either we should enhance xsltGetQNameURI() to check for validity or we should validate the value before passing to xsltGetQNameURI().

"qnames.xsl"
------------
<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:foo="urn:test:foo">
  <xsl:output cdata-section-elements=": foo:bar:boo"/>
  <xsl:template match="/">
  	<foo/>
  </xsl:template>  
</xsl:stylesheet>

xsltproc qnames.xsl ..\test.xml
<?xml version="1.0"?>
<foo xmlns:foo="urn:test:foo"/>