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  1. PO
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    <p><strong>It is possible to create XPath expressions dynamically in XSLT, but no dynamic evaluation of these expressions is possible (at least until <a href="http://www.w3.org/TR/2010/WD-xslt-21-20100511/#element-evaluate" rel="nofollow noreferrer">XSLT 2.1</a>).</strong></p> <p>What you want can be done in another way in XSLT. </p> <p><strong>Here is an example:</strong></p> <p>This transformation:</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:my="my:my" &gt; &lt;xsl:output omit-xml-declaration="yes" indent="yes"/&gt; &lt;my:criteria&gt; &lt;criterion&gt;a&lt;/criterion&gt; &lt;criterion&gt;b&lt;/criterion&gt; &lt;criterion&gt;c&lt;/criterion&gt; &lt;/my:criteria&gt; &lt;xsl:template match="node()|@*"&gt; &lt;xsl:copy&gt; &lt;xsl:apply-templates select="node()|@*"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;xsl:template match="*[name()=document('')/*/my:criteria/*]"&gt; &lt;xsl:element name="{name()}-{name()}" namespace="{namespace-uri()}"&gt; &lt;xsl:apply-templates select="node()|@*"/&gt; &lt;/xsl:element&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>when applied on this XML document</strong>:</p> <pre><code>&lt;t&gt; &lt;a&gt; &lt;x/&gt; &lt;y/&gt; &lt;b&gt; &lt;c/&gt; &lt;d/&gt; &lt;/b&gt; &lt;/a&gt; &lt;/t&gt; </code></pre> <p><strong>produces</strong>:</p> <pre><code>&lt;t&gt; &lt;a-a&gt; &lt;x&gt;&lt;/x&gt; &lt;y&gt;&lt;/y&gt; &lt;b-b&gt; &lt;c-c&gt;&lt;/c-c&gt; &lt;d&gt;&lt;/d&gt; &lt;/b-b&gt; &lt;/a-a&gt; &lt;/t&gt; </code></pre> <p><strong>That is, we only processed in a special way any element (anywhere in the document), whose name was <code>a</code> or <code>b</code> or <code>c</code>.</strong></p>
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    1. PODynamically generate XPath expression using XML data
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    1. USDimitre Novatchev
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      1. VTUpMod
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    1. COhmm.. ok, this may work for what I am doing. I need to play around with it to see what you are doing. The XPath expressions I have played around with aren't as complex as yours, so I need to learn what you have there first. What I need to do is generate an XPath to be used to create another XSL which transforms an entirely different XML file.. I know how to create an XSL from an XSL, I just need to dynamically create XPath expressions. If I could modify variables (which I read from somewhere else I can't) I would just keep concatenating nodes together to form an expression.
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    2. CO@iHeartGreek: Just provide a small example -- everything can be done with XSLT when the problem is well defined. Don't try to solve it just in your way -- in XSLT as in any functional language the ways to solve problems are quite different from those in imperative programming.
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      1. USDimitre Novatchev
    3. CO@iHeartGreek: There is nothing complex about this solution -- this is really a very short and simple transformation. You are welcome to ask (best in a separate question) how this "works", or about things you want to do with XSLT, but don't know how.
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