dynamic xpath question

I'm using XUpdate in an application where the XPath to the node I'm  
modifying is stored in the document.  For example, my document  
fragment looks like the following:
<form>
    <xpath>/mods/titleInfo/subTitle</xpath>
    <document>
        <mods>
            <titleInfo>
                <title>Sound and fury</title>
                <subTitle>my sub title</subTitle>
            </titleInfo>
         </mods>
    </document>
</form>

I'm trying to create an XUpdate variable which uses the data found  
in /form/xpath.  I'm trying the following without success:
<xu:variable name="path-to-node" select="/form/xpath"/>
<xu:variable name="sub" select="concat('/form/document', $path-to- 
node)"/>
Any advice on this would be most appreciated.  Thank you.

Duane Gran


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