Publishing and Using Linked Open Data - Day 5

Embed Size (px)


Beyond Linked Data - Reasoning and the Semantic Web

Text of Publishing and Using Linked Open Data - Day 5

  • 1. Publishing and UsingLinked Open DataRichard J. Urban, Ph.D.School of Library and Information StudiesFlorida State #lod4h

2. January 11, 2013Fridays Schedule 9:00-10:45 am Class Session Beyond Linked Data: Reasoning and theSemantic Web 10:45 am- 11:00break 11:00-11:45 Class Session: Open Project Studio Noon- 1:45 pmLunch (on your own) 1:45-2:30 pm Class Wrap-Up: Linked Open Data for the Humanities: Next Steps? 2:30-2:45 pm Break 2:45-3:45 pm Show and Tell 3:45-4:00 pm Closing Ceremony and Announcements #lod4h 3. An ontology is an explicit specification of a conceptualization. (Gruber)DERI Using Ontologies 4. OWL Versions OWL Full Allows most kinds of assertions, but notcomputationally complete. OWL Description Logics (OWL DL) As expressive as possible why maintainingcomputational completion/decidability. Based in Description Logics OWL Lite owl:disjointWith, unionOf, and others not allowed. Cardinality limited Equivalence limited to class identifiers Not much easier than OWL DL#lod4h 5. Class axiomsA B ABunionOf intersection B Acomplement #lod4h 6. Class axioms A A B B subclassOfequivalenceABdisjoint #lod4h 7. Property Types Functional A person can have only one spouse. Inverse hasChild is inverse of hasParent Inverse-Functional Links domains and ranges. The object of a biologicalMotherOf is a women. Transitivity Chianti, Tuscany and Italy are regions, and Chianti is a subregion of Tuscany, and Tuscany is a subregion of Italy, then Chianti is also a subregion of Italy. Symmetric If Jack is married to Jill, then Jill is married to Jack #lod4h 8. Identity owl:sameAsTwo resources are equivalent resources owl:differentThantwo resources are different resources#lod4h 9. OWL Reasoners Racer FaCT HermiT Some reasoning examples#lod4h 10. Beyond OWL Semantic Web Rule Language (SWRL) Based on Horn logic instead of DescriptionLogic #lod4h 11. So what? Collection/Item Metadata Relationshipsresearch. #lod4h