2014 | OriginalPaper | Buchkapitel
Definability for Downward and Vertical XPath on Data Trees
verfasst von : Sergio Abriola, María Emilia Descotte, Santiago Figueira
Erschienen in: Logic, Language, Information, and Computation
Verlag: Springer Berlin Heidelberg
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We study the expressive power of the downward and vertical fragments of XPath equipped with (in)equality tests over data trees. We give necessary and sufficient conditions for a class of pointed data trees to be definable by a set of formulas or by a single formula of each of the studied logics. To do so, we introduce a notion of saturation, and show that over saturated data trees bisimulation coincides with logical equivalence.