xs:xref is the element that the user may put into the source document to make a cross reference to another part of the document. It translates in the obvious way to a standard HTML link, and the link text is the cross-reference label.

xsl:template match="xs:xref"
      <a>
        xsl:attribute name="href"
          xsl:call-template name="map-uri"
        
    
        xsl:call-template name="xref-label"
      </a>
    

xref-label gets the cross-reference label (as XHTML2 markup) for the target element. It is called upon when processing xs:xref elements, but may also be used in other contexts.

The information is looked up in the site map, in particular, the xs:label element, defined above under the XSL key labels.

xsl:template name="xref-label"
      xsl:param name="href" select="@href"
    
      xsl:variable name="absolute-href"
        xsl:call-template name="absolute-uri"
          xsl:with-param name="href" select="$href"
        
      

      xsl:choose
        xsl:when test="count($site-map-doc)>0"
          xsl:for-each select="$site-map-doc"
            xsl:choose
              xsl:when test="key('labels', $absolute-href)/node()"
                xsl:apply-templates select="key('labels', $absolute-href)/node()"
              
              xsl:otherwise
                xsl:apply-templates select="document(@href)" mode="for-xref-label"
              
            
          
        
    
        xsl:otherwise
          xsl:apply-templates select="document(@href)" mode="for-xref-label"