Dynamic XSLT Evaluation?

I've been studying Chiba implementation of xforms.xsl and I've noticed that
there is an evaluation of XPath statements that dynamically resolves an
XPath expression at runtime.   I am referring to the following:

 

<xsl:when
test="xforms:value=xalan:evaluate(concat($InstanceNodeStr,$absref))">

 

This looks to be a xslt processer specific implementation.  Is there any
means of doing this xslt processor neutral?

 

Thanks,

 

Al



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