[xsl] Trying to check if key is NOT found

["russurquhart1@xxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

 Hi,

I have a snippet of xsl to try and look through our document xml, and let me know if a given CrossRefence href attribute  does NOT contain an element with a matching Target attribute. The href attribute value is some string of characters, prefixed by a '#'.  There are several elements that can have a Target attribute so i wrote my xsl like the following:

 .c9Y6TC { color:#0000ff; }.c49DIK { color:#ac306d; }.c18YC0 { color:#d00020; }.c5M9S0 { color:#000090; }.c69ORU { color:#aaaba0; } <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0">

 <xsl:key name="target_ref_key" match="*[@Target]" use="@Target" />

  <xsl:template match="CrossReference">

    <xsl:variable name="unhash_name" select="substring-after(@href, '#')"/>
    <xsl:variable name="matched" select="key('target_ref_key', $unhash_name)"/>
    <xsl:if test="not($matched)">
     No target for:
     <xsl:value-of select="$unhash_name"/>
    </xsl:if>

  </xsl:template>


</xsl:stylesheet> 

I had read some place on the web that this xsl:if would work to let me know when a key did NOT find any value, but it doesn't seem to be being called. I get the xml file as it is. 

Is this the correct way to do this, or is there a better way?

thanks for any help,


Russ