Re: Creating Forward/Backward HTML links from multi-fi

I am using XSL to translate a set of XML documents into a corresponding set of HTML documents. I am stuck trying to figure out how to create <a > ... </a> links in HTML that display forward and backward pointers through the web pages.
...
Each topic has the following (partial) structure:

<<<<<

<topic>
<!-- Used to link topics together -->
<menu>
<file>overview</file>
<display>overview</display>
<next>overview2</next>
<prior>introduction</prior>
</menu>
<course>Course Name</course>
<section>Overview</section>
<title>Overview</title>
<abstract></abstract>
...
I would prefer to keep the meta information about topic sequence out of each topic file.

Basically, as I understand it, I need to point backward one sibling topic and forward one sibling topic and detect the end cases where there is no forward/backward sibling.

  <xsl:if test="preceding-sibling::topic">
    <a href="{preceding-sibling::topic[1]/file}.htm">
      <xsl:value-of select="preceding-sibling::topic[1]/title"/>
    </a>
  </xsl:if>

  <xsl:if test="count(key('files',file))>1">
     <xsl:message terminate="yes">Duplicate filename!</xsl:message>
  </xsl:if>

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