Alistair Miles SKOSxmluk2005

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Published on December 4, 2007

Author: craig

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SKOS Core A language to describe simple knowledge structures for the web:  SKOS Core A language to describe simple knowledge structures for the web Alistair Miles, CCLRC Rutherford Appleton Laboratory Brian Matthews, CCLRC / W3C Michael Wilson, CCLRC / W3C Dan Brickley, W3C Dave Beckett, ILRT Nikki Rogers, ILRT Semantic Web Best Practices and Deployment What is SKOS Core?:  What is SKOS Core? Simple Knowledge Organisation Systems Simple, flexible, extensible machine-understandable representation for knowledge organisation systems … Controlled vocabularies Taxonomies Thesauri Classification Schemes Glossaries Subject Heading Systems Categorisation Schemes … What is SKOS Core?:  What is SKOS Core? Application of the Resource Description Framework (RDF) … An RDF Vocabulary Flexible Extensible Serialisable (RDF/XML … RDF/A-XHTML2) What is SKOS Core?:  What is SKOS Core? W3C Working Draft Published & Maintained by Semantic Web Best Practices and Deployment Working Group (SWBP-WG) First Public Working Draft 10 May 2005 Public, open-source, community-driven (initiated by SWAD-Europe project) Work in progress Well-defined change management process Revised working drafts every 3 months Features:  Features Identifying concepts URIs for unambiguous global identity and reference Labelling concepts e.g. lexical labels, symbolic labels, (audio labels?), preferred, alternative, hidden … Describing & documenting concepts e.g. definition, example, scope note, change note, editorial note … Relating concepts e.g. broader, narrower, related … Grouping concepts e.g. concept schemes, support for ‘node labels’ … Subject Indexing e.g. subject of a document, primary subject … Multilingual Thesaurus Example:  Thesaurus Example Term: Economic cooperation Used For: Economic co-operation Broader terms: Economic policy Narrower terms: Economic integration, European economic cooperation, European industrial cooperation, Industrial cooperation Related terms: Interdependence Scope Note: Includes cooperative measures in banking, trade, industry etc., between and among countries. From UK Archival Thesaurus … Thesaurus Example:  Thesaurus Example Thesaurus Example:  Thesaurus Example <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:skos="http://www.w3.org/2004/02/skos/core#"> <skos:Concept rdf:about="http://www.ukat.org.uk/thesaurus/concept/1750"> <skos:prefLabel>Economic cooperation</skos:prefLabel> <skos:altLabel>Economic co-operation</skos:altLabel> <skos:scopeNote>Includes cooperative measures in banking, trade, industry etc., between and among countries.</skos:scopeNote> <skos:broader rdf:resource="http://www.ukat.org.uk/thesaurus/concept/4382"/> <skos:narrower rdf:resource="http://www.ukat.org.uk/thesaurus/concept/2108"/> <skos:narrower rdf:resource="http://www.ukat.org.uk/thesaurus/concept/9505"/> <skos:narrower rdf:resource="http://www.ukat.org.uk/thesaurus/concept/15053"/> <skos:narrower rdf:resource="http://www.ukat.org.uk/thesaurus/concept/18987"/> <skos:related rdf:resource="http://www.ukat.org.uk/thesaurus/concept/3250"/> <skos:inScheme rdf:resource="http://www.ukat.org.uk/thesaurus"/> </skos:Concept> </rdf:RDF> RDF/XML serialisation … Flexible:  Flexible ‘Pic’n’mix SKOS Core with other vocabs, e.g. Dublin Core, RSS, FOAF … Extensible:  Extensible Extended labelling properties e.g. common name, scientific name Extended concept types e.g. AAT’s fundamental facets Extended documentation properties e.g. MARC21, DDC Extended semantic relation properties e.g. broader instantive, broader generic, broader partitive Can cope with specialised requirement without compromising interoperability Application:  Application Application of SKOS Core for faceted browsing Application:  Application SKOS & OWL:  SKOS & OWL OWL decidable, logically precise, classes and instances many knowledge structures e.g. thesauri, classification scheme, taxonomies not rigorous enough, require additional modelling for pure OWL representation SKOS Core can be ‘fuzzier’, concepts knowledge structures e.g. thesauri, classification schemes, taxonomies require no additional modelling for SKOS representation, can get from direct programmatic transformation from legacy a migration path? Complementary Can use in combination can have an ontology with classes of concepts maximise trade-off between benefit of explicit semantics and cost of creation/maintenance SKOS World View:  SKOS World View Summarise:  Summarise Representation of knowledge structures Application of RDF W3C Working Draft Flexible Extensible Interesting:  Interesting Mapping Web Service API Terminologies & translation, dictionaries … SWBPD-WG:  SWBPD-WG XHTML 2.0 Meta-information Module RDF in XHTML Ontology Engineering Patterns RDF Vocabulary Management RDF – TM interoperability Software Engineering Multimedia Links:  Links SKOS Core Web Site http://www.w3.org/2004/02/skos/core/ Comments and discussion public-esw-thes@w3.org SWED http://www.swed.org.uk/

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