Indexing Tree Elements

I have a template that is called for all instances of an element;
is it possible that it may compare its attributes with the attributes
of the previous document-tree node of the same level?  Is it possible
to index elements in such a manner?

Thanks in advance,
Lee
-- 
Lee Goddard  <l.goddard@sussex>
Research Centre for Cognitive Science, 
University of Sussex, Brighton UK


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