Unused function or template parameter

A parameter the body never references is dead code. Every xsl:with-param supplying it is dead too, and on an xsl:function every call still passes a value the body ignores. Delete the parameter and the arguments that supply it, or, if it was meant to be read, look for a misspelled reference.

Incorrect:

<xsl:template name="greet">
  <xsl:param name="name"/>
  <p>Hello</p>
</xsl:template>

Correct:

<xsl:template name="greet">
  <xsl:param name="name"/>
  <p><xsl:value-of select="concat('Hello, ', $name)"/></p>
</xsl:template>

Only a reference in an XPath expression or a value template counts; the name in result text, a string literal, or a comment does not. A required="yes" parameter is left alone.