Re: [xsl] Selecting from a node-set using variable path

Subject: Re: [xsl] Selecting from a node-set using variable path
From: "J.Pietschmann" <j3322ptm@xxxxxxxx>
Date: Tue, 18 Feb 2003 21:30:42 +0100
gary fong wrote:
This works:
 <xsl:variable name="t1" select="$myNodeSet//a/b/c"/>

This doesn't:
 <xsl:variable name="t2" select="$myNodeSet/$myPath"/>

Ah, this comes up regularly. It's something like doing String a="1 + 1"; int b=1+a; in Java and expecting this is not only doesn't cause the compiler to barf but that b is 3 afterwards.

How do I filter down my node-set based upon some variable
location path?
For simple cases there are pure XPath solutions, however,
in your case you'll have to use an extension function to
invoke a runtime XPath interpreter, for example
 <xsl:variable name="myPath">/a/b/c</xsl:variable>
 <xsl:variable name="t3"
The inner concat evaluates to the string
which in turn is evaluated as XPath expression.

Um, well, IIRC MSXML does not have exactly such an extension
function, but you can use a bit of JScript code to emulate
this. The EXSLT project at sourceforge should have such code.


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