dynamic xpath in xslt?

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Dynamic XPath evaluation is not possible in pure XSLT 1.0 or 2.0.

There are at least three ways to do this in a “hybrid” solution:

I. Use the EXSLT function dyn:evaluate()

Unfortunately, very few XSLT 1.0 processors implement dyn:evaluate().

II. Process the XML document with XSLT and generate a new XSLT file that contains the XPath expressions — then execute the newly-generated transformation.

Very few people do this and, in my opinion, this is more complex than the next solution.

III. The way the XPath Visualizer works

The idea is:

  1. Have a global variable in the XSLT stylesheet defined like this:

      <xsl:variable name="vExpression" select="dummy"/>

  2. Then, load the stylesheet as an XML document using DOM, and replace the select attribute of the vExpression variable with the actual XPath expression that is contained in the source XML document.

  3. Finally, initiate the transformation using the loaded into memory and dynamically updated xslt stylesheet.

IV. With XSLT 3.0

Use the <xsl:evaluate> instruction

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