Hyspirit is a retrieval engine for hypermedia retrieveval integrating concepts fro minfromation retrieval and deductive databases. The logical view on IR models retrieval as uncertain inference, for which we use probabilistic reasoning. Since the exressiveness of classical IR models is not sufficient for hypermedia retrieval, Hyspirit is based on a probabilistic version fo Datalog. In hypermedia retrieval, different nodes may contain contradictory information; thus, we introduce probabilitstic four-valued datalog. In order to support fact queries as well as content-based retrieval, Hyspirit is based on an open world assumption, but allows for predicate-specific closed world assumptions. For performing efficient retrieval on alrge databases, our systme provids access to extermal data. We demonstrate the applciation of HYspirit by giving examples for retrieval on image,s structured documents and large databases.
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