Reasoning over RDF data
Dynamic Querying of Mass-Storage RDF Data with Rule-Based Entailment Regimes?
SPARQL is the W3C standard for querying RDF data, but it mostly provides means for querying simple RDF graphs only, whereas querying with respect to [...]
SPARQL Beyond Subgraph Matching
This paper describes the extension of the Semantic Web query language SPARQL by defining the semantics of SPARQL queries under the entailment regimes of RDF, [...]
Foundations of Semantic Web Technologies: SPARQL Entailment Regimes
Slides covering the following topics: SPARQL can now be used with RDF Schema, OWL, and RIF semantics. Entailment Regimes overwrite evaluation of basic graph patterns. [...]
Schema-Agnostic Query Rewriting in SPARQL 1.1
SPARQL 1.1 supports the use of ontologies to enrich query results with logical entailments, and OWL 2 provides a dedicated fragment OWL QL for this [...]
SPARQL 1.1 Entailment Regimes
There are different possible ways of defining a basic graph pattern matching extension for an entailment relation. This document specifies one such way for a [...]
SPARQL Query Containment under RDFS Entailment Regime
This research paper addresses the problem of SPARQL query containment, which is defined as determining if the result of one query is included in the [...]
Answering SPARQL Queries over Databases under OWL 2 QL Entailment Regime
This paper presents an extension of the ontology-based data access platform Ontop that supports answering SPARQL queries under the OWL 2 QL direct semantics entailment [...]
Querying Semantic Web Data with SPARQL (and SPARQL 1.1)
This lengthy slide presentation covers SPARQL 1.1. It begins with the fundamentals: graph patterns, operators, and algebraic representations. The second half dives deeply into complex [...]
Towards Reconciling SPARQL and Certain Answers
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, [...]
ELITE: An Entailment-based Federated Query Engine for Complete and Transparent Semantic Data Integration
In recent years, the core of the Semantic Web has evolved to a conceptual layer built by a set of ontologies mapped onto data distributed [...]