Using namespace axis

XPath 2.0 deprecated the namespace:: axis. Outside backwards compatible mode a processor may refuse it with the static error XPST0010, so the same stylesheet compiles on one processor and fails on the next. Read namespace bindings with in-scope-prefixes() and namespace-uri-for-prefix(), which every 2.0 processor has.

Incorrect:

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="html"/>
  <xsl:template match="*">
    <xsl:for-each select="namespace::*">
      <xsl:value-of select="."/>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

Correct:

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="html"/>
  <xsl:template match="*">
    <xsl:variable name="element" select="."/>
    <xsl:for-each select="in-scope-prefixes($element)">
      <xsl:value-of select="namespace-uri-for-prefix(., $element)"/>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

Only XSLT 2.0 and later stylesheets are checked. A namespace:: step of a match pattern is left alone, since no function can stand there.