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MSO Querying over Trees via Datalog Evaluation

By Eugénie Foustoucos and Labrini Kalantzi


Abstract. The MSO evaluation problem on trees is the problem of computing, for any MSO formula φ and any finite tree T,thesetofsatisfying assignments of φ(X1,...,Xk) overT. In [3] we considered the MSO evaluation problem on full binary trees as a Datalog query evaluation problem, and gave a Datalog-theoretic solution to it for any MSO formula φ; we thus subsumed previous results obtained for a restricted class of MSO, namely for unary MSO queries. In the present paper we extend the results of [3] both to r-ary trees and to unranked trees, thus providing a general Datalog-theoretic solution to the problem for the class of finite trees.

Year: 2013
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