Unused function

A stylesheet function that is called from no expression anywhere in the corpus — neither in its own stylesheet nor in one that imports it — is dead code and should be removed. A function that is called, but only from within a recursion cycle that nothing enters, is caught by unreachable-function instead.

Incorrect:

<xsl:function name="my:format">
  <xsl:param name="value"/>
  <xsl:value-of select="$value"/>
</xsl:function>
<!-- my:format is never referenced in match or select -->

Correct:

<xsl:function name="my:format">
  <xsl:param name="value"/>
  <xsl:value-of select="$value"/>
</xsl:function>

<xsl:template match="/">
  <p><xsl:value-of select="my:format(title)"/></p>
</xsl:template>