Re: [xsl] unordered lists from xml to html

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2002-04-28 12:31 +1000, Ian Hord wrote:
> You will see that the attributes in the para element determine whether the
> paragraph should be in a bullet or not.

Adding structure where there is none is a far more difficult transform than 
flattening structure.  The richer your XML, the easier your transform.

To get your solution, you need to algorithmically walk the structure 
determining siblings that are grouped together.  This "breaks" the inherent 
tree processing of XSLT and the resulting XSLT is far more imperative than 
declarative.  That isn't to say it cannot be done, just that the solution 
doesn't take advantage of the inherent XSLT processing model.

A solution is below.  Note the power of the use of multiple predicates in 
an XPath expression and how the order of the predicates is critical to the 
answer.

I hope this helps.

................... Ken

t:\ftemp>type ian.xml
<?xml version="1.0" encoding="iso-8859-1"?>
<summary>
<para bullet="1">This is paragraph 1
</para>
<para bullet="0">This is paragraph 2
</para>
<para bullet="1">This is paragraph 3
</para>
<para bullet="1">This is paragraph 4
</para>
</summary>
t:\ftemp>type ian.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output indent="yes"/>

<xsl:template match="summary">
  <xsl:apply-templates select="para[1]"/><!--walk through one at a time-->
</xsl:template>

<xsl:template match="para"><!--either standalone or first of a group-->
  <xsl:choose>
    <xsl:when test="@bullet='1'"><!--first of a group-->
      <ul>
        <xsl:apply-templates select="." mode="in-a-group-of-siblings"/>
      </ul>
          <!--skip all those in the group and start at the next standalone-->
      <xsl:apply-templates select="following-sibling::para[@bullet='0'][1]"/>
    </xsl:when>
    <xsl:otherwise><!--standalone-->
      <p><xsl:value-of select="."/></p>
      <xsl:apply-templates select="following-sibling::para[1]"/><!--next-->
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

<xsl:template match="para" mode="in-a-group-of-siblings">
  <li><xsl:value-of select="."/></li>
                    <!--only continue if the next one belongs in the group-->
  <xsl:apply-templates select="following-sibling::para[1][@bullet='1']"
                       mode="in-a-group-of-siblings"/>
</xsl:template>

</xsl:stylesheet>

t:\ftemp>xt ian.xml ian.xsl
<?xml version="1.0" encoding="utf-8"?>
<ul>
<li>This is paragraph 1
</li>
</ul>
<p>This is paragraph 2
</p>
<ul>
<li>This is paragraph 3
</li>
<li>This is paragraph 4
</li>
</ul>

t:\ftemp>
t:\ftemp>xt ian.xml ian.xsl
<?xml version="1.0" encoding="utf-8"?>
<ul>
<li>This is paragraph 1
</li>
</ul>
<p>This is paragraph 2
</p>
<ul>
<li>This is paragraph 3
</li>
<li>This is paragraph 4
</li>
</ul>

t:\ftemp>



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G. Ken Holman                mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
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