Accessing the element stack generically

Hello.  I have an xml document:

<a><b><c/></b><c/></a>

I'd like to, when match="c" is invoked, print
the current element stack.  Any generic way to do this?

 /a/b/c and /a/c are what I'm after...

Harder version:

 <a><b x="y"><c/></b><b x="z"><c/></b></a>

Print the element stack including parameters to get:

 /a/b[@x='y']/c  and /a/b[@x='z']/c

Thanks for any suggestions.

clark


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