XSLT - looking for evaluate() to build dynamic XPATHs

Hi,
I am using the oracle api to process an XSLT and was trying to get the xalan:evaluate() function working.
Having problems as the first param is an ExpressionContext which I am not sure what to set it to.
Anyone have any experience with this or any of the XPath.evaluate calls from the oracle libraries?
Cheers

Set the XPath expression as a String.
http://xml.apache.org/xalan-j/extensionslib.html#evaluate

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