Simple XPath question

Is there a way in XPath to find all PERSON's such that there exists
another PERSON such that the two people have identical @firstname and
@lastname attributes? I think that without an XPath built-in variable
feature, this is impossible. Do you agree?
-- 
 Paul Prescod  - ISOGEN Consulting Engineer speaking for himself
Bart: Dad, do I really have to brush my teeth?
Homer: No, but at least wash your mouth out with soda.



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