id idref pairs

I have xml which looks like

<doc>

<test id="x">
   </test>




<test>
  link to <link idref="x"/>blah
</test>

</doc>


I want to output, in html,
  <p>link to TN 1 blah</p>


I have 
<xsl:template match="link">
   TN&sp; <a href="#{@idref}"> 
<xsl:call-template name="testnum" >
       <xsl:with-param name="node" select="@idref"/>
      </xsl:call-template></a>
   <xsl:apply-templates/>
  </xsl:template>

 <xsl:template name="testnum">
    <xsl:param name="node" select="."/>
    <xsl:choose>
      <xsl:when test="id($node)">
    <xsl:for-each select="id($node)">
      <xsl:text>TN:&sp;</xsl:text><xsl:number count="test"
level="any"/><xsl:text>&sp;</xsl:text>
    </xsl:for-each></xsl:when>
    <xsl:otherwise><xsl:text>No TN for link</xsl:text>
  </xsl:otherwise>
</xsl:choose>
  </xsl:template>


My intent (not currently working), is to provide as output, the 
 number of the test in the document, by changing context from the calling
test
to that of the called test. I *think* the id(@idref) gives me the 
target node, and in the testnum context, the for-each changes context.
The test is to ensure I have the id attribute in the target element.

 Its not working. And I can't see why.

Any help appreciated.

TIA, DaveP




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