SPARQL entailment regimes are strongly influenced by the big body of works on ontology-based query answering, notably in the area of Description Logics (DLs). However, the semantics of query answering under SPARQL entailment regimes is defined in a more naive and much less expressive way than the certain answer semantics usually adopted in DLs. The goal of this work is to introduce an
intuitive certain answer semantics for SPARQL and to show the feasibility of this approach. It shows that the complexity of the most fundamental query analysis tasks (such as query containment and equivalence testing) is not
negatively affected by the presence of OWL 2 QL entailment under
the proposed semantics.
URL: http://www.simkus.info/wp-content/uploads/2014/10/sparql-certain.pdf
Keywords: Web Ontology Language (OWL), SPARQL, Description Logics, Query rewriting, Basic Graph Pattern (BGP)
Author: Fischl, Wolfgang
Publisher: Pichler, Reinhard
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P30M
Educational use: instruction
Educational audience: teacher-educationSpecialist
Interactivity type: expositive
- Knows that Web Ontology Language (OWL) is available in multiple "flavors" that are variously optimized for expressivity, performant reasoning, or for applications involving databases or business rules
- Uses common entailment regimes and understands their uses.
- Uses OPTIONAL to formulate queries to return the values of optional variables when available.