Abstract
We present an algorithm for query evaluation given a logic program consisting of function-free Datalog rules. The algorithm is based on Earley Deduction [7,10], but uses explicit states to eliminate rules which are no longer needed, and partial evaluation to minimize the work at runtime. At least in certain cases, the new method is more efficient than our SLDMagic-method [2], and also beats the standard Magic set method. It is also theoretically interesting, because it consumes one EDB fact in each step. Because of its origin, it is especially well suited for parsing applications, e.g. for extracting data from web pages. However, it has the potential to speed up basic Datalog reasoning for many semantic web applications.
This is a significantly extended and improved version of a paper that appeared in the 26th Workshop on Logic Programming (WLP’12).
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Brass, S., Stephan, H. (2013). A Variant of Earley Deduction with Partial Evaluation. In: Faber, W., Lembo, D. (eds) Web Reasoning and Rule Systems. RR 2013. Lecture Notes in Computer Science, vol 7994. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-39666-3_4
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DOI: https://doi.org/10.1007/978-3-642-39666-3_4
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