Re: 'qname' is not a valid XSLT or XPath function

I'm new to XML, and I saw an example template that used the following:

<xsl:if test="not(from-preceding-siblings(*[qname(.)=context().qname(.)]))">
<h1><xsl:value-of select="qname(.)"/></h1>
</xsl:if>

  <xsl:if test="not(preceding-sibling::*[name(.)=name(current())])">
    <h1><xsl:value-of select="name(.)"/></h1>
  </xsl:if>

This is a way for selecting distinct XML elements... I think.

If someone could either explain it to me, or point me to a good
tutorial/reference that I could read about what I'm supposed to do to get
this to work, I would appreciate it.

http://www.w3.org/TR/1999/REC-xpath-19991116
http://www.w3.org/TR/1999/REC-xslt-19991116

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