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sparql linkeddata linked data rdf link traversal based query execution linked data query querying processing intro linkeddata webofdata trust squin webofdata query semantics provenance tutorial caching data cache resource description framework sfsw swcllib researchersmap tsparql eswc queryoptimization sqgm semantics rdfs response time webdata linked data theory trustworthiness query ldql research query planning ltbqe execution process live exploration source selection theoretical foundations computability optimization introduction source ranking access w3c prov-aq storage query optimization heuristics semantic web index query execution linkeddata webofdata trustworthiness trust provenance vocabulary linkeddata webofdata linkeddata squin sparql query webofdata linktraver provenance linkeddata rdf webofdata webdata qualit