An Automata-Theoretic Approach to Regular XPath

  title={An Automata-Theoretic Approach to Regular XPath},
  author={Diego Calvanese and Giuseppe De Giacomo and Maurizio Lenzerini and Moshe Y. Vardi},
In this paper we present Regular XPath (RXPath), which is a natural extension of XPath with regular expressions over paths that has the same computational properties as XPath: linear-time query evaluation and exponential-time reasoning. To establish these results, we devise a unifying automata-theoretic framework based on two-way weak alternating tree automata. Specifically, we consider automata that have infinite runs on finite trees. This enables us to leverage and simplify existing automata… CONTINUE READING
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