Reasoning about XML with temporal logics and automata

13 years 3 months ago

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We show that problems arising in static analysis of XML speciﬁcations and transformations can be dealt with using techniques similar to those developed for static analysis of programs. Many properties of interest in the XML context are related to navigation, and can be formulated in temporal logics for trees. We choose a logic that admits a simple single-exponential translation into unranked tree automata, in the spirit of the classical LTL-to-B¨uchi automata translation. Automata arising from this translation have a number of additional properties; in particular, they are convenient for reasoning about unary node-selecting queries, which are important in the XML context. We give two applications of such reasoning: one deals with a classical XML problem of reasoning about navigation in the presence of schemas, and the other relates to verifying security properties of XML views. Keywords Query automata, static analysis, temporal logics, XML

Leonid Libkin, Cristina Sirangelo

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