Subhedge Projection for Stepwise Hedge Automata
Résumé
We show how to evaluate stepwise hedge automata (Shas) with subhedge projection. This requires passing finite state information top-down, so we introduce the notion of downward stepwise hedge automata. We use them to define an in-memory and a streaming evaluator with subhedge projection for SHAs. We then tune the streaming evaluator so that it can decide membership at the earliest time point. We apply our algorithms to the problem of answering regular XPath queries on XML streams. Our experiments show that subhedge projection of SHAs can indeed speed up earliest query answering on XML streams.
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