A Logic-Based System for Application Integration
ICLP '02 Proceedings of the 18th International Conference on Logic Programming
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Integration of heterogeneous information sources requires building an infrastructure for accessing several different information sources together. One task of the integration is to provide a uniform interface to the different information sources (databases, directory servers, web services, web sites, XML files). The other task is the semantic integration: the meaning of the stored data is also different in the different sources. In the SILK [1] system (Semantic Integration with Knowledge and Logic), semantic integration is carried out by providing a high-level model and the mappings between the high-level model and the models of the sources.When executing a query of the high-level model, the query has to be transformed to queries of the sources and to the code performing the semantic transformation of the data. The component which translates a high-level query to a low level query is the Query Planner. The Query Planner builds the set of low-level queries, and a further component is needed to create an efficient query plan from it. This component in the SILK system is called the Query Optimizer.