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Re: Problems to interpret an attribute value as an Xpa

Subject: Re: Problems to interpret an attribute value as an Xpath expression
From: Joerg Pietschmann <joerg.pietschmann@xxxxxx>
Date: Thu, 10 Jan 2002 16:51:08 +0100
xpa problems
"Roman Huditsch" <roman.huditsch@xxxxxxxx> wrote:
> I'd like to use the value of a ref attribute as an
> XPath expression in my stylesheet.
> I used a "normal" <xsl:value-of select="@ref"/> ,but
> the processor didn't interpret it as an XPath expression
> but as a string.

Well, the processor evaulates the expression "@ref" and
gets for example the string "/applicationform/applicant[1]/name"
as a result. It won't evaulate this string again just because
it looks like a XPath expression. After all, if the value of
the attribute were "foo", you didn't expect the processor to
do so, did you?

> Does anyone know a method to tell the processor to use a
> source document's attribute value as an XPath expression
> in the stylesheet?

There is no standardized way to do it. Most processors
have extension functions like saxon:evaluate() for this
purpose, look it up in the documentation. With MSXML
you'll probably need some JScript.

Seems i have to withdraw my objections about having
evaluate() in the next XPath standard. Life [expletive deleted] sometimes.


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