Is this possible using XSLT?

Hello,

Is it possible to get XSLT to transform XML that looks
like this:
<foo>
    <bar leftparen="((" rightparen="" num="3" oper="*"
/>
    <bar leftparen="" rightparen=")" num="2" oper="-"
/>
    <bar leftparen="" rightparen=")" num="2" />
</foo>

into something that looks like this:
<foo>
   <paren>
     <paren>
       <bar num="3" oper="*"/>
       <bar num="2" oper="-"/>
     </paren>
     <bar num="2"/>
   </paren>
</foo>

"paren" elements are opened and closed based on the
number of '(' in each element's leftparen and
rightparen attributes.
Can anyone help?
Thanks,

Rob



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