An extension of data automata that captures XPath

Published 3 Jan 2012 in cs.LO and cs.FL | (1201.0597v2)

Abstract: We define a new kind of automata recognizing properties of data words or data trees and prove that the automata capture all queries definable in Regular XPath. We show that the automata-theoretic approach may be applied to answer decidability and expressibility questions for XPath.

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