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LAA

Seminar

Complete axiomatisation for PDLpath

Alechina, N (Nottingham)
Thursday 02 March 2006, 16:15-17:00

Seminar Room 1, Newton Institute

Abstract

PDLpath is a logic introduced in [1] to express path constraints on graphs of semistructured data. Its language contains one nominal r, which is true at the root node, standard PDL modalities, converse, and a new modality #, which stands for "some edge label". We assume that the language contains countably infinitely many atomic modalities or labels. We provide a complete axiomatisation of PDLpath and a new decidability proof for it (another proof is in [1]).

[1] N. Alechina, S. Demri and M. de Rijke. A modal perspective on path constraints. Journal of Logic and Computation, 6(3), 2003, pages 939-956.

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