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Metadata for webontologies and rules: current practices and perspectives Carlos Tejo-Alonso, Diego Berrueta, Luis Polo and Sergio Fernández

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Context<rdf:Description rdf:about="#Bicycle "> <rdf:type rdf:resource="&owl;Class"/> logic <rdfs:subClassOf rdf:resource="#Vehicle"/> <rdfs:label xml:lang="en">bicycle</rdfs:label> <dct:description xml:lang="en"> Vehicle consisting of two wheels held in a frame one behind other, propelled by pedals </dct:description> annotation <dc:creator>Iván Mínguez</dc:creator></rdf:Description>

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Motivation to annotate• Facilitate search• Improve exchange and reuse• Link them to the natural language• Generate reference documentation

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Overview• Current ontology & rule metadata usage• Proposed vocabulary to annotate rules• Parrot, a documentation tool for ontologies and rules• Conclusions/Future Work

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Metadata vocabularies• General purpose: DC, SKOS or RDFS – dc:creator, skos:prefLabel, rdfs:comment• For ontologies: OWL – owl:versionInfo• For rules: no specific vocabulary (with significant adoption)

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Ontology metadata study

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Ontology metadata study• Massive use of RDF Schema(label & comment)• Property synonymy dc:description rdfs:comment dct:description skos:definition• Absence of: – multimedia – legal rights and license information – expressive multilingual metadata

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Rule metadata: a proposalMetadata Recommended propertiesLabeling dc:title, dct:title, rdfs:label, skos:prefLabel, skos:altLabelAuthoring foaf:maker, dc:creator, dc:contributor, dc:publisher, dct:creator, dct:contributor, dct:publisherDescription dc:description, dct:description, rdfs:comment, skos:definition, skos:example, skos:noteMultimedia foaf:depiction, og:videoVersioning owl:versionInfo, dct:hasVersion, skos:changeNoteRights dc:rights, dct:licenseDate dc:date, dct:issued, dct:modifiedDocumentation dct:source, rdfs:seeAlso, rdfs:isDefinedBy

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Annotated rule (example)(* ex:rule ex:rule [rdfs:label -> “Example Rule”@endc:creator -> “Luis Polo” annotatiodc:date -> “1981-01-20”og:video -> n <http://youtu.be/5h10QHpA5EU>dct:publisher -> http://ontorule-project.eu] *)Forall ?person ?age (If And( ?person #foaf :Person logic ?person [foaf:age -> ?age] External(pred:numeric-less-than(?age 18)) )Then Do( Assert(?person#ex:Under18Person) )

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Parrot overview OWL Report RIF• Multimedia-rich, customizable reports for humans• Supports multiple metadata• Combination of rules and ontologies• Supports multilingual annotations

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Parrot usage Web serviceEclipse plugin Command Line Interface

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Parrot DEMOhttp://ontorule-project.eu/parrot

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Conclusions• Ontology metadata exists in the wild, but there is still room for improvement• Metadata facilitate rule exchange between Business Rules Management System• We expect to impact on the quality and quantity of the metadata annotations in rules and ontologies

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Future work• To expand the analysis to large ontologies• To account the use of metadata in RIF documents as they become available• To extend proposal of rule metadata properties as new requirements arise

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Thanks for your attention contact: carlos.tejo@fundacionctic.orghttp://www.flickr.com/photos/ockam/2591316903/

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About this presentation Fifth Metadata and Semantics Research Conference (MTSR 2011) 12-14 October 2011 Yaşar University, Izmir – TURKEY http://mtsr2011.yasar.edu.tr

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Acknowledgements This work has been partially supported by the European Commission under ONTORULE project