[xsl] Slow XSLT

[Cleyton Jordan <cleytonjordan@xxxxxxxxxxx>]

Hi,

I am using XSLT 1.0 and IE6

I have written the XSLT below and it works fine.
However, when the XML has lots of RowGrp elements then
it becomes quite slow to transform.

The difficulty that I am having is to find a way to
speed it up. I think there could be two problems with
my XSLT:

1 - Recursion in the ColGrp Template mode="header"  

<xsl:for-each
select="//ColGrp[count(ancestor::ColGrp)=$depth]">

2 - Also, when I am in the Col Template I have to go
back to the measures element for each Col

<xsl:for-each select="//Col">
  <xsl:apply-templates select="//Measures">
    <xsl:with-param name="pos" select="position()" />
  </xsl:apply-templates>
</xsl:for-each>

I would appreciate if someone could sched some light.
I have read Jeni's XSLT pages (key and grouping) but
have not found any posts or example similar to mine.

Cheers

C
===========================
XML
<Reports>
<Report xmlns="">
  <Measures>
    <Measure idx="1" heading="Total Pages" />
    <Measure idx="2" heading="Cost" />
  </Measures>
  <Columns>
    <ColGrp heading="Quarter">
      <ColGrp heading="2003">
        <Col heading="Quarter 1" />
        <Col heading="Quarter 2" />
        <Col heading="Quarter 3" />
        <Col heading="Quarter 4" />
      </ColGrp>
      <ColGrp heading="2004">
        <Col heading="Quarter 1" />
        <Col heading="Quarter 2" />
        <Col heading="Quarter 3" />
        <Col heading="Quarter 4" />
      </ColGrp>
    </ColGrp>
    <!--===TOTALS====-->
    <ColGrp>
      <ColGrp>
        <Col heading="Total" />
      </ColGrp>
    </ColGrp>
  </Columns>
</Report>
</Reports>

==============================

XSLT

<xsl:param name="axisHeads" select="'false'" />

  <xsl:variable name="msrs">
    <xsl:choose>
      <xsl:when test="//Measure">
        <xsl:value-of select="count(//Measure)"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="1"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

 <xsl:template match="Reports">
    <xsl:apply-templates
select="Report"></xsl:apply-templates>
  </xsl:template>
  
  <xsl:template match="Report" >
      <!-- Top -->
      <div id="g1" style="position: absolute; top:
0px; left: 0px; width: 400px; height: 12px">
        <table class="grdTop" border="0"
cellspacing="1" cellpadding="0">
          <tbody>
            <xsl:apply-templates select="Columns" />
          </tbody>
        </table>
      </div>
   </xsl:template>

  <xsl:template match="Columns">
    <xsl:apply-templates select="ColGrp[1]"
mode="Header">
      <!-- 0 for top level heading, 1 to cut it out
-->
      <xsl:with-param name="depth">
        <xsl:choose>
          <xsl:when test="$axisHeads='true'">
            <xsl:value-of select="0"/>
          </xsl:when>
          <xsl:otherwise>
            <xsl:value-of select="1"/>
          </xsl:otherwise>
        </xsl:choose>
      </xsl:with-param>
    </xsl:apply-templates>
  </xsl:template>
 
  <xsl:template match="ColGrp" mode="Header">
    <xsl:param name="depth" />
    <tr>
      <!-- the very first row needs a padding cell -->
      <xsl:for-each
select="//ColGrp[count(ancestor::ColGrp)=$depth]">
          <td colspan="{count(.//Col)*$msrs}"
align="center" style="overflow:none">
          <nobr>
            <div>
              <xsl:value-of select="@heading"/>
            </div>
          </nobr>
        </td>
      </xsl:for-each>
    </tr>
    <xsl:choose>
      <xsl:when test="ColGrp"> 
        <xsl:apply-templates select="ColGrp[1]"
mode="Header">
          <xsl:with-param name="depth"
select="$depth+1" />
        </xsl:apply-templates>
      </xsl:when>
      <xsl:otherwise>
        <xsl:apply-templates select="Col[1]"
mode="colHead" />
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

  <xsl:template match="Col" mode="colHead">
    <tr>
      <xsl:for-each select="ancestor::Columns//Col">
        <td colspan="{$msrs}" valign="top"
align="center" style="overflow:none">
          <nobr>
            <!-- 2003/2004 -->
            <div>
              <xsl:value-of select="@heading"/>
            </div>
          </nobr>
        </td>
      </xsl:for-each>
    </tr>
    <tr valign="bottom">
      <xsl:for-each select="//Col">
        <xsl:apply-templates select="//Measures">
          <xsl:with-param name="pos"
select="position()" />
        </xsl:apply-templates>
      </xsl:for-each>
    </tr>
  </xsl:template>

  <xsl:template match="//Measures">
    <xsl:param name="pos" />
    <xsl:for-each select="Measure">
      <xsl:variable name="mPos">    
        <xsl:value-of select="position()" />
      </xsl:variable>
      <td align="center">
        <nobr>
          <div class="action" style="width:90px;
overflow:none"  onclick="sortFullGrid({$mPos}, {$pos},
'{@class}')">
            <xsl:value-of select="@heading"/>
          </div>
        </nobr>
      </td>
    </xsl:for-each>
  </xsl:template>



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