RE: Creating lists and sublists from a level attribute

Here's an adaptation of a stylesheet I presented at the Oxford summer
school: a recursive template using XSLT 2.0 xsl:for-each-group. 

<xsl:template name="process-level">
  <xsl:param name="population" required="yes" as="element(heading)*"/>
  <xsl:param name="level" required="yes" as="xs:integer"/>
  <xsl:if test="$population">
   <ul>
    <xsl:for-each-group select="$population" 
                group-starting-with="*[xs:integer(@level) eq $level]">
     <li>
      <p><xsl:value-of select="."/></p>   
      <xsl:call-template name="process-level">
        <xsl:with-param name="population" select="current-group() except
."/>
        <xsl:with-param name="level" select="$level + 1"/>
      </xsl:call-template>
     </li>
    </xsl:for-each-group>
   </xsl:if>
  </ul>
</xsl:template>

Call it like this:

<xsl:call-template name="process-level">
  <xsl:with-param name="population" select="child::heading"/>
  <xsl:with-param name="level" select="1"/>
</xsl:call-template>

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: Andrew Brothwell [mailto:ANBROTH@xxxxxxxxxx] 
> Sent: 01 September 2004 14:16
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Creating lists and sublists from a level attribute
> 
> Hi,
> 
> I currently have a series of <heading> tags in the xml file. 
> These are not 
> 
> embedded within each other, but have a level attribute to 
> indicate which 
> ones are sub headings of others. For instance:
> 
> <heading level="1">A main Heading</heading>
> <heading level="2">Sub heading of main heading</heading>
> <heading level="2">another sub heading of main heading</heading>
> <heading level="1">Another main Heading</heading> 
> 
> There can be up to 4 levels.
> 
> What I am trying to achieve is a "document outline" at the 
> top of the page 
> 
> that takes each heading and puts it in a list, with sub 
> headings being 
> sublists of their parent headings. I am struggling to find a way to 
> arrange the <ul> and <li> tags to achieve this, and any help 
> would be much 
> 
> appreciated.
> 
> thanks, 
> 
> Andy