Recursive Strategies for Answering Recursive Queries - The RQA/FQI Strategy

  title={Recursive Strategies for Answering Recursive Queries - The RQA/FQI Strategy},
  author={Wolfgang Nejdl},
In this paper we will discuss several methods for recursive query processing using a recursive control structure. We will describe the QSQR method, introduced in [Vie861 and show that it fails to produce all answers in certain cases. After analyzing the causes of this failure we propose an improved algorithm the RQA/FQI Strategy which is complete over the domain of function-free Horn clauses. The new method uses a two step approach recursive expansion + an efficient variant of LFP iteration to… CONTINUE READING
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