Re: [xsl]cascading evaluation of variables

[David Carlisle <davidc@xxxxxxxxx>]

You can't evaluate a string as an Xpath expression in Xpath (or XSLT)
just as you can't evaluate a string "x + 1" In C or java or most other
languages, without writing a parser for the language contained in the
string.
Saxon (and perhaps some other systems) does offer an evaluate()
extension function that does provide an XPath parser and evaluation
system at run time.

the way do do this in pure XSLT is first write out a stylesheet
containing the generated Xpath, then execute the second stylesheet.

Also, don't do

<xsl:variable name="essai"><xsl:value-of select="$path1"/>
</xsl:variable>


do

<xsl:variable name="essai" select="$path1"/>


(and similarly your other variable settings)

It's a lot less to type and a lot nore efficient to execure.

If I read your xpath correctly, for this simple case you don't really
need to generate a string and use dynamic evaluation, you can just
execute the Xpath directly.

I think tour source looks like
<something select="foo"/>

and you want to select the parent  of <foo> in the $sourcefile document,
so that would be

<xsl:variable name="select" select="@select"/>
<xsl:copy-of select="document($sourcefile)//*[name()=$select]/.."/>

David

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