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Brandon H.Subject: XSLT - Trapped in Recursive Template Loop
Author: Brandon H.
Date: 01 Dec 2005 04:21 PM
I have an XSL stylesheet which is transforming XML into Excel. One section of the report using some complicated recursive looping to generate a 3 column tiling function.

The stylesheet uses two templates to achieve this tiling - code as follows.

<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:html="http://www.w3.org/TR/REC-html40">
.....

<!--- Here is the template call from the main template -->
<xsl:apply-templates select="/OFFER/KIT-Children/KIT" />
.....

<!--- Here is the match template for KIT --->
<xsl:template match="KIT">
<xsl:call-template name="Kits">
<xsl:with-param name="cycle_count" select="1" />
</xsl:call-template>
</xsl:template>

<xsl:template name="Kits" xmlns="urn:schemas-microsoft-com:office:spreadsheet">

<xsl:param name="cycle_count" />

......
<xsl:if test="some logic test">
......

<xsl:call-template name="Kits">
<xsl:with-param name="cycle_count" select="$cycle_count + 1" />
</xsl:call-template>

</xsl:if>

</xsl:template>


I walk this transformation with my debugger and see that it fails the <xsl:if.../> logic test and exits the 'Kits' named template, but then the transform loops back to the:

<xsl:template match="KIT">
<xsl:call-template name="Kits">
<xsl:with-param name="cycle_count" select="1" />
</xsl:call-template>
</xsl:template>

Which calls the named 'Kits' template again with the reset 'cycle_count' parameter - this causes the transformation to get stuck in a never-ending recursive loop.

Any ideas as to what I am doing wrong here?
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Minollo I.Subject: XSLT - Trapped in Recursive Template Loop
Author: Minollo I.
Date: 01 Dec 2005 05:21 PM
Brandon,
from what you are describing I would expect the match="KIT" template to be executed as many times as many /OFFER/KIT-Children/KIT elements you have in your source document, because you are doing <xsl:apply-templates select="/OFFER/KIT-Children/KIT"/>.

But I wouldn't expect an infinite loop as long as the <xsl:if> logic is properly implemented. Have you verified if the match="KIT" template is being executed every time with the same context note? You can see the context node in the Stylus Studio Variables window.

Minollo
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Brandon H.Subject: XSLT - Trapped in Recursive Template Loop
Author: Brandon H.
Date: 02 Dec 2005 11:10 AM
Minollo,

Thanks a lot - that was exactly the problem. I was matching on 'KIT' which was returning 15 nodes, thus making my match template run 15 times.

I moved the match down one level and was able to make small modifications to my nodeset loads to solve the problem.

Thanks again.

Brandon
 
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