Matthew Horridge

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We present the OWL API, a high level Application Programming Interface (API) for working with OWL ontologies. The OWL API is closely aligned with the OWL 2 structural specification. It supports parsing and rendering in the syntaxes defined in the W3C specification (Functional Syntax, RDF/XML, OWL/XML and the Manchester OWL Syntax); manipulation of(More)
This paper describes a new syntax that can be used to write OWL ontologies, and fragments of OWL ontologies for presentation and editing purposes. The syntax, which is known as the Manchester OWL Syntax, was developed in response to a demand from a wide range of users, who do not have a Description Logic background, for a“less logician like” syntax. The(More)
Finding the justifications of an entailment (that is, all the minimal set of axioms sufficient to produce an entailment) has emerged as a key inference service for the Web Ontology Language (OWL). Justifications are essential for debugging unsatisfiable classes and contradictions. The availability of justifications as explanations of entailments improves(More)
Understanding the logical meaning of any description logic or similar formalism is difficult for most people, and OWL-DL is no exception. This paper presents the most common difficulties encountered by newcomers to the language, that have been observed during the course of more than a dozen workshops, tutorials and modules about OWL-DL and it’s predecessor(More)
Sequences are a natural part of the world to be modelled in ontologies. Yet the Web Ontology Language, OWL, contains no specific support for ordering. It does, however, have constructs that can be used to model many aspects of sequences, albeit imperfectly. This paper demonstrates a design pattern for modeling order within OWL-DL. This allows us to use(More)
Protégé is one of the most widely used development platforms for ontology-based systems. We report on our experiences with the development of OWL support for Protégé, and on the experiences of our user community with OWL. While the overall feedback from the community has been positive, our experience suggests that there are considerable gaps between the(More)
OBO is an ontology language that has often been used for modeling ontologies in the life sciences. Its definition is relatively informal, so, in this paper, we provide a clear specification for OBO syntax and semantics via a mapping to OWL. This mapping also allows us to apply existing Semantic Web tools and techniques to OBO. We show that Semantic Web(More)