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Ian Horrocks
Researcher at University of Oxford
Publications - 488
Citations - 40046
Ian Horrocks is an academic researcher from University of Oxford. The author has contributed to research in topics: Ontology (information science) & Description logic. The author has an hindex of 87, co-authored 472 publications receiving 38785 citations. Previous affiliations of Ian Horrocks include The Turing Institute & National and Kapodistrian University of Athens.
Papers
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Journal ArticleDOI
Tractable query answering and rewriting under description logic constraints
TL;DR: A novel query rewriting algorithm is presented that handles constraints modeled in the DL ELHIO ¬ and it is used to show that answering conjunctive queries in this setting is PTime -complete w.r.t. data complexity.
Book ChapterDOI
RDFox: A Highly-Scalable RDF Store
TL;DR: An overview of the system architecture is presented and the main ideas behind the indexing data structures and the novel reasoning algorithms of RDFox are highlighted, which supports materialisation-based parallel datalog reasoning and SPARQL query answering.
Journal ArticleDOI
Bridging the gap between OWL and relational databases
TL;DR: This paper extends OWL with integrity constraints that capture the intuition behind similar statements in relational databases, and shows that, if the integrity constraints are satisfied, they need not be considered while answering a broad range of positive queries.
Proceedings ArticleDOI
Reviewing the design of DAML+OIL: an ontology language for the semantic web
TL;DR: DAML+OIL's relation with its key ingredients is reviewed, the design decisions and trade-offs that were the basis for the language definition are discussed, and a number of implementation challenges posed by the current language are identified.
Book ChapterDOI
DAML+OIL: A Reason-Able Web Ontology Language
TL;DR: DAML+OIL is an ontology language specifically designed for use on the Web that exploits existing Web standards (XML and RDF), adding the familiar ontological primitives of object oriented and frame based systems, and the formal rigor of a very expressive description logic.