Date post: | 16-May-2015 |
Category: |
Documents |
Upload: | richard-urban |
View: | 520 times |
Download: | 1 times |
#lod4h
Publishing and Using Linked Open Data
Richard J. Urban, Ph.D.
School of Library and Information StudiesFlorida State [email protected]@musebrarian
#lod4h
January 11, 2013Friday’s Schedule
• 9:00-10:45 am Class Session Beyond Linked Data: Reasoning and the Semantic Web
• 10:45 am- 11:00 break
• 11:00-11:45 Class Session: Open Project Studio
• Noon- 1:45 pm Lunch (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
“An ontology is an explicit specification of a conceptualization.” (Gruber)
DERI Using Ontologies http://www.deri.org/fileadmin/documents/DERI-TR-2003-10-29.pdf
#lod4h
OWL Versions
• OWL Full– Allows most kinds of assertions, but not computationally
complete.
• OWL Description Logics (OWL DL)– As expressive as possible why maintaining computational
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
Class axioms
A B
unionOf intersection
A
complement
A B
B
#lod4h
Class axioms
BA
BA
subclassOf equivalence
BA
disjoint
#lod4h
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
Identity
• owl:sameAsTwo resources are equivalent resources
• owl:differentThantwo resources are different resources
#lod4h
OWL Reasoners
• Racer• FaCT • HermiT
• Some reasoning examples
#lod4h
Beyond OWL
• Semantic Web Rule Language (SWRL)http://www.w3.org/Submission/SWRL/
• Based on Horn logic instead of Description Logic
#lod4h
So what?
• Collection/Item Metadata Relationships research.http://goo.gl/FQldG