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OWL Application Profile for CSW

OWL Application Profile for CSW. Dr Kristin Stock Allworlds Geothinking , UK Centre for Geospatial Science, University of Nottingham, UK EDINA, UK. Introduction. COMPASS Project ( http://compass.edina.ac.uk/ ) Created a geospatial knowledge infrastructure, allowing:

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OWL Application Profile for CSW

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  1. OWL Application Profile for CSW Dr Kristin Stock AllworldsGeothinking, UK Centre for Geospatial Science, University of Nottingham, UK EDINA, UK

  2. Introduction • COMPASS Project (http://compass.edina.ac.uk/) • Created a geospatial knowledge infrastructure, allowing: • semantic discovery of scientific resources and • visualisation and inference. • So we needed a semantic registry. • OGC Pending Doc 09-010

  3. The Goal • Semantic expressiveness and inference • Syntactic interoperability with other registries (geospatial and Digital Library) • Scientific resources: • Publications • Geospatial data sets • Geospatial web services

  4. Some content best suited to ontologies (require reasoning, not in registry standards)... • Domain concepts; • Semantic description of scientific resources; • Semantic description of scientific knowledge in the resources; • Web service semantics.

  5. Some content best suited to registries (in existing RIMs): • Textual descriptions; • Publication binding; • Web service specifications and bindings; BUT... • The latter already in web service ontologies.

  6. So... • Did not want some content in registry, some in ontologies. • Decided to put everything in ontologies. But how?

  7. The problem • Need to keep OWL ontologies in OWL files to allow easy reasoning. • Did not want to duplicate content or have to do live conversion between ontology and registry information models. • So, created an ontology-registry.

  8. What is an Ontology-Registry? • Architecture is designed as an interface on top of OWL files, so reasoning can be done on native file formats with existing tools. • Generic model across domains. • Registry = ontologies; ontologies = registry.

  9. Information Model • Uses RDF and OWL • Adopts RDF/OWL information model as closely as possible so retain ontology structure.

  10. What about ebRIM? • The ontology-registry is not an extension package to WRS. • Why? • Would need to convert between ebRIM and OWL between interface and file store. • The models are quite different. • Querying and results handling more difficult. • Both are meta-models. • Unnecessary extra processing.

  11. A new Application Profile • The ontology-registry is an OWL Application Profile for CSW. • Implements CSW, not WRS. • Can handle any RDF or OWL content.

  12. User Interface The Ontology- Registry CSW Interface Knowledge Management Adapter Z39.50 Adapter OAI-PMH Adapter Inference Engine Knowledge Management Middleware Z39.50 Interface OAI-PMH Interface Digital Library Repository Digital Library Repository OWL Ontologies

  13. Queryable and Returnable Properties (1) • Uses Dublin Core specific metadata items. • Adds bounding box: • App profile includes OWL definition of bounding box. • Adds rdfs:Resource, which can specialise to anything in RDF or OWL.

  14. Queryable and Returnable Properties (2) • Implementers must map their ontologies to the queryable and returnable properties. • You retrieve an ontology in its OWL form using the queryable and returnable properties.

  15. Querying • In addition to FILTER, adds SPARQL querying. • Both available for request and response. • Specify query language in request. • Examples included in document.

  16. Interfaces • Implements CSW interfaces. • Extended to include: • SPARQL querying • Reasoning: • Satisfiability, Subsumption, Equivalence, Disjointedness, Consistency, InstanceChecking (for entailment). • In GetRecords or DescribeRecord.

  17. It’s only a meta model! • No indication of the content of the ontologies. • We implemented a series of ontologies (web service, domain, application). • It is up to the provider of the service to map the semantics of their own ontologies to the queryable and returnable properties, except rdfs:Resource

  18. Questions or Comments? or contact me: kristin.stock@nottingham.ac.uk

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