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SWI-Prolog offers an extensive library for loading, saving and querying Semantic Web documents called the semweb package. Internally, the query language is `Prolog', building on top of an efficient implementation of a predicate rdf/3 expressing the content of the triple store.
ClioPatria provides a ready-ro-run web-server on top of this infrastructure. The web-server contains a SPARQL endpoint, user management and web-based tools to help the developer analysing the loaded RDF.