Re: [xsl] Unique list of all linked documents

[Jeni Tennison <jeni@xxxxxxxxxxxxxxxx>]

Hi Edward,

> I need to get a unique list of all documents that are linked to a
> document. The list must include documents that are linked from
> linked documents to an arbitrary level.

You need a recursive template that will travel through the documents
for you. Here's a recursive template that navigates through a set of
documents, collecting together (and eventually returning) a
space-separated list of their URLs:

<xsl:template name="collectDocuments">
  <!-- $documents holds the root nodes of documents to be processed,
       starting from the root node of the source document -->
  <xsl:param name="documents" select="/" />
  
  <!-- $URLs holds the space-separated list of URLs -->
  <xsl:param name="URLs" />

  <xsl:choose>
    <!-- if there are more documents to be processed... -->
    <xsl:when test="$documents">
      <!-- ... collect together the URLs of those documents (as long
           as we haven't already got them -->
      <xsl:variable name="next"
        select="/documents/doc/@href[not(contains($URLs, .))]" />

      <!-- call the template recursively, passing... -->
      <xsl:call-template name="collectDocuments">
        <!-- the root nodes of those documents to $documents -->
        <xsl:with-param name="documents"
                        select="document($next, .)" />
        <!-- $URLs plus the space-separated URLs that we've just found
             -->
        <xsl:with-param name="URLs">
          <xsl:value-of select="concat($URLs, ' ')" />
          <xsl:for-each select="$next">
            <xsl:value-of select="." />
            <xsl:if test="position() != last()">
              <xsl:text> </xsl:text>
            </xsl:if>
          </xsl:for-each>
        </xsl:with-param>
      </xsl:call-template>
    </xsl:when>
    
    <!-- if there aren't any more documents to be processed, return
         the value of $URLs -->
    <xsl:otherwise>
      <xsl:value-of select="$URLs" />
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list