资源论文An Assertion Retrieval Algebra for Object Queries over Knowledge Bases

An Assertion Retrieval Algebra for Object Queries over Knowledge Bases

2019-11-12 | |  37 |   28 |   0
Abstract We consider a generalization of instance retrieval over knowledge bases that provides users with assertions in which descriptions of qualifying objects are given in addition to their identi?ers. Notably, this involves a transfer of basic database paradigms involving caching and query rewriting in the context of an assertion retrieval algebra. We present an optimization framework for this algebra, with a focus on ?nding plans that avoid any need for general knowledge base reasoning at query execution time when suf?cient cached results of earlier requests exist.

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