[xsl] Passing variables into XSLT via parameters ... can't get it to work

Subject: [xsl] Passing variables into XSLT via parameters ... can't get it to work
From: Duncan Anker <danker@xxxxxxxxxxxxx>
Date: Tue, 23 May 2006 11:59:27 +1000
Hi List,

I have a setup where I want to store my HTML pages as XML and use XSLT to apply common layout features, e.g. headers and footers. I also need to pass dynamic data into some of the pages, and rather than process everything twice I (perhaps foolishly) thought I could use parameters to send the data in. So I have a $parameters variable which contains a string something like '<parameters><namespace variable1="value" variable2="value" /></parameters>'

In my HTML fragments where I want to place a variable, I use a call-out like

<variable name="namespace:variable1" />

Then in my XSLT I have this:
<xsl:template match="variable">
<xsl:variable name="a" select="substring-before(@name, ':')" />
<xsl:variable name="b" select="substring-after(@name, ':')" />
<xsl:value-of select="exslt:node-set($parameters)//*[name() = $a]/@*[name() = $b]" />

[As an aside, I couldn't get the substring-before and -after to work directly in the XPath expression. Am I missing something, or do they need to be assigned to variables like that to be used?]

This all seems to work well enough when the $parameters string is set inside the stylesheet, however when I try to pass it in as a global parameter I get empty results. I know the string is making it in because <xsl:value-of select="$parameters" /> prints out the escaped string. What I can't figure out is why it is not being treated the same way as a local variable would be.

Can anyone shed any light on this? I've spent 2 days banging my head against Google so far. I am trying to do this with PHP 5.1.4 compiled against libXML and lbXSLT, versions 2.6.23 and 1.1.15 respectively. I'd like to finger PHP as the culprit, but I get the same results when running xsltproc over the documents.


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