Subject: [xsl] Stange behavior with parameters, can somebody explain? From: Gunther Schadow <gunther@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 17 Jan 2002 02:45:16 -0500 |
Help! I'm ripping my heair out on this one. Please explain why the effect of with-param in apply-templates select='expr' depends on whether expr is an xpath selector on the current document or a synthesized node-set.
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:exsl="http://exslt.org/common" exclude-result-prefixes="exsl"> <!-- For MSXSL use this instead xmlns:exsl="urn:schemas-microsoft-com:xslt" -->
<xsl:template match="ROOT"> <xsl:copy> <xsl:apply-templates select='child::node()[1]'/> </xsl:copy> </xsl:template>
<xsl:template match="BAR"> <xsl:param name='P'/> <BAR P='{$P}'/> </xsl:template>
Now I show you two variants of templates to deal with the FOO element. The first one uses the xpath selector:
<xsl:template match="FOO"> <FOO/> <xsl:apply-templates select='following-sibling::node()[1]'> <xsl:with-param name='P' select="'V'"/> </xsl:apply-templates> </xsl:template>
<?xml version="1.0" encoding="iso-8859-1"?> <ROOT> <FOO/> <BAR P="V"/> </ROOT>
<xsl:template match="FOO"> <FOO/> <xsl:variable name='SYNTH'> <BAR/> </xsl:variable> <xsl:apply-templates select='exsl:node-set($SYNTH)'> <xsl:with-param name='P' select="'V'"/> </xsl:apply-templates> </xsl:template>
<?xml version="1.0" encoding="iso-8859-1"?> <ROOT> <FOO/> <BAR P=""/> </ROOT>
as you see, here the parameter P <= V was not carried into the applied templates. Why is that?
I tried with both saxon and msxml and they both do the same thing.
Whatever it is, it is very obscure and makes my life very difficult.
Of course you don't see the use case from this dummed down example. My use case is string parsing for 'up-translation' where I match a head of a string then clip off the head and apply the templates on the rest of the text node. I cannot pass any parameters through this kind of process, ouch!
regards -Gunther
PS: workaround seems to be to wrap the rest of the text node in an element with parameters as attributes or something. Argh!
-- Gunther Schadow, M.D., Ph.D. gschadow@xxxxxxxxxxxxxxx Medical Information Scientist Regenstrief Institute for Health Care Adjunct Assistant Professor Indiana University School of Medicine tel:1(317)630-7960 http://aurora.regenstrief.org
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