XPath-Expression

Hi all,

I want to use the content of an XML-Tag to be
 interpreted as an XPath expression within a
stylesheet.
For example

<XPath>/elem1/child1<XPath>

would be a tag within the input XML-Document and the content of
this tag has to be interpreted as an XPath expression within a stylesheet.
Is there any way to convert a string into a nodeset or are there any other
possibilities ?
Thank you for your efforts and
best regards

André Mengel

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