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Linking KOS Data [using SKOS and OWL2]

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Linking KOS Data [using SKOS and OWL2]

  1. 1. Extracted slides from a presentation at Seminar on Knowledge Organization, School of Information and Library Science University of North Carolina, 2010-03-29 Marcia Zeng Kent State University KOS = knowledge organization systems {thesaurus, classification systems, taxonomies, subject heading lists, picklists, ontologies}
  2. 2. Illustration of triples subjects predicates subjects objects predicates objects 17 3 3 1 2 1 2 Background image borrowed from Andrea Kosavic: The Semantic Web, (some of) what you need to know . OLA Superconference 2009.01.30. Compiled by mzeng 2009-03-06 .
  3. 3. http://en.wikipedia.org/wiki/Antoni_Gaud%C3%AD From Wikepedia to dbpedia, a linked data example
  4. 4. http://dbpedia.org/page/Antoni_Gaudí 4. Include links to other URIs so that they can discover more things <ul><li>Use URIs as names for things </li></ul><ul><li>Use http URIs </li></ul>3. When someone looks up a name, provide useful [RDF] information 1 2 3
  5. 5. [related subject categories, for further exploration] [labels for this person] See next
  6. 6. Wikipedia’s classification Has broader concepts Concept’s label Has narrower concept http://dbpedia.org/page/Category:Spanish_architects Subject category as ‘resource’ Any of these resources will bring to other linked data
  7. 7. Back to the triples: http://www.example.org/index.html dc.language en http://www.example.org/index.html skos:subject Health care (conceptID) properties & values Metadata Schemas KOS Vocabularies supporting sharable data 1 1 2 2 3 3 …
  8. 8. <ul><li>bibo -- Bibilographic ontology </li></ul><ul><li>cc -- Creative Commons ontology </li></ul><ul><li>damltime -- Time Zone ontology </li></ul><ul><li>doap -- Description of a Project ontology </li></ul><ul><li>event -- Event ontology </li></ul><ul><li>foaf -- Friend-of-a-Friend ontology </li></ul><ul><li>frbr -- Functional Requirements for Bibliographic Records </li></ul><ul><li>geo -- Geo wgs84 ontology </li></ul><ul><li>geonames -- GeoNames ontology </li></ul><ul><li>mo -- Music Ontology </li></ul><ul><li>opencyc -- OpenCyc knowledge base </li></ul><ul><li>owl -- Web Ontology Language </li></ul><ul><li>pim_contact -- PIM (personal information management) Contacts ontology </li></ul><ul><li>po -- Programmes Ontology (BBC) </li></ul><ul><li>rss -- Really Simple Syndicate (1.0) ontology </li></ul><ul><li>sioc -- Socially Interlinked Online Communities ontology </li></ul><ul><li>sioc_types -- SIOC extension </li></ul><ul><li>skos -- Simple Knowledge Organization System </li></ul><ul><li>umbel -- Upper Mapping and Binding Exchange Layer ontology </li></ul><ul><li>wordnet -- WordNet lexical ontology </li></ul><ul><li>yandex_foaf – FOAF extension ontology </li></ul>Linked Data -- class diagram http://umbel.org/lod_constellation.html
  9. 9. <ul><li>LCSH: http://id.loc.gov </li></ul><ul><li>Dewey Decimal Classification: http://dewey.info </li></ul><ul><li>The New York Times Thesaurus: http://data.nytimes.com/ </li></ul><ul><li>Other LC vocabularies </li></ul><ul><li>Many other thesauri </li></ul>
  10. 10. Has alternative labels has broader concepts has narrower concepts has related concept has similar concept in another scheme 1 has preferred label 1 LCSH: http://id.loc.gov human-readable
  11. 11. 1 2 has alternative labels Has these broader concepts 3 Has these narrower concepts machine-processable
  12. 12. http://dewey.info/ human-readable
  13. 13. 1 has notation has preferred label has narrower concept/class http://dewey.info/class/6/2009/03/about.de.rdf http://dewey.info/class/6/2009/03/about.de.html 2 3
  14. 14. http://dewey.info/class/641/about has caption ddc22 Class 641 641 has notation 食品 & 饮料 食品 & 饮料 食品 & 饮料
  15. 15. <ul><li>-- [With Michael Panther, Dewey Decimal Classification, OCLC] </li></ul><ul><li>1. Extension of SKOS (papers and presentations at pre-ISKO2008 and DC2009) </li></ul><ul><li>2. Using OWL 2 to express complex classes and relationships (paper at ISKO 2010) </li></ul>
  16. 16. Complex class expressions are needed for synthesized classes <ul><li>by adding numbers from other parts of the schedule, </li></ul><ul><li>by adding numbers from a table, or </li></ul><ul><li>by basing it on a pattern defined in another part of the schedule. </li></ul>Auxiliary tables rules combine add Subject schedule A Subject schedule B 1 2 2 follow 3 To accommodate new subjects and reflect the nature of interdisciplinary, instructions are provided to the classifier to construct a number in practice:
  17. 17. <ul><li>Classification numbers may be built according to rules </li></ul><ul><li>Theoretically unlimited classes can be built </li></ul><ul><li>Example from DDC: </li></ul>821.008 Collections of English poetry is built with 82 (following the instruction at 820.1-828 Subdivisions of English literature ) plus 100 (following the instruction at T3B--1001-T3B--1009 Standard subdivisions; collections; history, description, critical appraisal ) plus 8 Collections of literary texts from the add table at T3B--1-T3B--8 Specific forms .  821   English poetry  821.008   English poetry--collections  821.00803543   Love--poetry--English literature--collections, . . .  821.0080355   English poetry--social themes--collections, . . .  821.008036   English poetry--nature--collections, . . .  821.0080382   English poetry--religious themes--collections, . . .  821.00 9    English poetry--history and criticism  821.04   English poetry--lyric poetry, . . .  821.0708   Humorous poetry--English literature--collections, . . .  http://ddc.typepad.com/025431/ddc_tip_of_the_week/ Source: One Zero or Two? Dewey Blog. September 28, 2006 rules
  18. 18. Example from DDC 025.04 Information Storage and Retrieval Systems
  19. 19. <ul><li>Special types of concepts </li></ul><ul><ul><li>Non-assignable concepts </li></ul></ul><ul><ul><li>Concepts in auxiliary tables </li></ul></ul><ul><li>Index terms </li></ul><ul><li>Class–topic relationships </li></ul><ul><li>Internal structure of notes </li></ul><ul><li>Alternative classification notations </li></ul><ul><li>Orders/sequences of coordinate classes </li></ul>
  20. 20. <ul><li>Class expression </li></ul><ul><li>Built classes </li></ul><ul><li>Classes to be built according to rules and instructions </li></ul><ul><ul><li>Class : Class </li></ul></ul><ul><ul><li>Class + Auxiliary Table </li></ul></ul><ul><ul><li>Class + Added Table </li></ul></ul><ul><ul><li>Class + implied example </li></ul></ul><ul><li>Relationship expression </li></ul><ul><ul><li>Typical Class-to-class </li></ul></ul><ul><ul><li>SubClassOf </li></ul></ul><ul><ul><li>DisjointClasses </li></ul></ul><ul><ul><li>EquivelantClasses </li></ul></ul><ul><li>More complicated </li></ul><ul><ul><li>Class-to-class </li></ul></ul><ul><ul><li>Class-to-topic </li></ul></ul><ul><ul><ul><li>Index terms </li></ul></ul></ul><ul><ul><ul><li>‘ Class-here’ </li></ul></ul></ul><ul><ul><ul><li>‘ Class-elsewhere’ </li></ul></ul></ul><ul><ul><ul><li>‘ See’ reference </li></ul></ul></ul><ul><ul><ul><li>… </li></ul></ul></ul>
  21. 21. <ul><li>Summers, E. and Guenther R. (2009). SKOS, id.loc.gov and the World of Linked Data. NKOS/CENDI Workshop 2009. http://nkos.slis.kent.edu/2009workshop/EdSummersRebeccaGuenther.pdf </li></ul><ul><li>Kobilarov , G. et al. (2009). Media Meets Semantic Web – How the BBC Uses DBpedia and Linked Data to Make Connections . L. Aroyo et al. (Eds.): ESWC 2009, LNCS 5554, pp. 723–737, 2009. Springer-Verlag Berlin Heidelberg 2009 . http://www.georgikobilarov.com/publications/2009/eswc2009-bbc-dbpedia.pdf </li></ul><ul><li>Linking Open Data on the Semantic Web. W3C. http://esw.w3.org/topic/TaskForces/CommunityProjects/LinkingOpenData/CommonVocabularies </li></ul><ul><li>Panzer, M. and Zeng, M. (2009) Modeling Classification Systems in SKOS: Some Challenges and Best-Practice Recommendations. Proceedings of DC2009, Oct. 2009, Seoul, Korea http://dcpapers.dublincore.org/ojs/pubs/article/viewArticle/974 </li></ul><ul><li>Zeng, M., Panzer, M. and Salaba, A. (2010). Expressing Classification Schemes with OWL 2 Web Ontology Language--Issues and Opportunities. Proceedings of the International Society for Knowledge Organization (ISKO) 2010 Conference, Feb., 2010, Rome. </li></ul>