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Creating a Semantic Web with Linked Data

Creating a Semantic Web with Linked Data. Todd King. On the Road to Semantics. subject + predicate + object. FOAF. SPASE. Dublin Core. ???. From Introducing Linked Data and the Semantic Web http://www.linkeddatatools.com/semantic-web-basics. What is "Linked Data".

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Creating a Semantic Web with Linked Data

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  1. Creating a Semantic Web with Linked Data Todd King

  2. On the Road to Semantics subject + predicate + object FOAF SPASE Dublin Core ??? From Introducing Linked Data and the Semantic Web http://www.linkeddatatools.com/semantic-web-basics

  3. What is "Linked Data" • RDF triples with shared vocabularies. • Basic RDF triple (statement): subject+predicate+object • Both "subject" and "object" are URI. Note: General RDF allows object to be literal values. • General form in XML: <rdf:Descriptionrdf:about="subject">     <predicate rdf:resource="object" /> <rdf:Description> RDF does not provide semantics. Well known (shared) vocabularies are needed.

  4. Defining a Collection as Linked Data Using SPASE and SKOS A Collection called "Example" consisting of a NumericlaData collection and a Document. spase://vmo/NumericalData/ex1 skos:broader spase://vmo/Collection/example. spase://vmo/Document/ex1 skos:broader spase://vmo/Collection/example.

  5. The Big Question • Are associations best expressed external to the resources or internal? • External: Linked Data • Internal: Declared associations (i.e. Association in SPASE) • In either case a focal point for associations is needed.

  6. Background Information

  7. Well-Known Vocabularies • Friend-of-a-Friend (FOAF), vocabulary for describing people. • Dublin Core (DC) defines general metadata attributes. See also their new domains and ranges draft. • Semantically-Interlinked Online Communities (SIOC), vocabulary for representing online communities. • Description of a Project (DOAP), vocabulary for describing projects. • Simple Knowledge Organization System (SKOS), vocabulary for representing taxonomies and loosely structured knowledge. • Music Ontology provides terms for describing artists, albums and tracks. • Review Vocabulary, vocabulary for representing reviews. • Creative Commons (CC), vocabulary for describing license terms.

  8. Science Vocabularies • SESDI (Semantically-Enabled Science Data Integration) • SWEET (Semantic Web for Earth and Environmental Terminology) • SPASE (Space Physics Archive Search and Extract) • GEON (Geosciences Network) • VSTO (Virtual Solar-Terrestrial Observatory) • Noesis (Earth and Atmospheric Science Smart Search) • MMI (Marine Metadata Initiative) • VINE (Vocabulary Integration Environment Tool) • Hydroseek (ontology-aided search)

  9. RDF Statements SPASE Anything in XML can represented in RDF RDF As <Spase> <Version>2.0.1</Version> <Person> <ResourceID>spase://SMWG/Person/Todd.A.King</ResourceID> <ReleaseDate>2010-02-04T12:34:56.789</ReleaseDate> <PersonName>Todd A. King</PersonName> <OrganizationName> Institute of Geophysics and Planetary Physics, University of California, Los Angeles </OrganizationName> <Address> Institute of Geophysics and Planetary Physics, University of California Los Angeles, Box 951567, Los Angeles, CA 90095-1567 </Address> <Email>tking@igpp.ucla.edu</Email> <PhoneNumber>+1 310 206 7201</PhoneNumber> </Person> </Spase> <?xml version="1.0" encoding="UTF-8"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:spase="http://www.spase-group.org/rdf#">     <rdf:Descriptionrdf:about="spase://SMWG/Person/Todd.A.King">         <spase:PersonName>Todd A. King</spase:PersonName>         <spase:OrganizationName> Institute of Geophysics and Planetary Physics, University of California, Los Angeles </spase:OrganizationName>         <spase:Address> Institute of Geophysics and Planetary Physics, University of California Los Angeles, Box 951567, Los Angeles, CA 90095-1567 </spase:Address> <spase:Email>tking@igpp.ucla.edu</spase:Email> <spase:PhoneNumber>+1 310 206 7201</spase:PhoneNumber>     </rdf:Description> </rdf:RDF> Note: Slightly redacted and not using preferred namespaces in RDF version.

  10. Why Semantics? • Knowledge Integration • It allows branching across domains of knowledge. • Allows independent operation/evolution for each domain. Semantic Modeling consists of: • Vocabulary - A collection of terms given a well-defined meaning that is consistent across contexts. • Ontology - Allows you to define contextual relationships behind a defined vocabulary. Definitions from Introducing Linked Data and the Semantic Web

  11. Semantic Web • The Semantic Web • Is a paradigm shift from the relational or hierarchical means of modeling data to a graph model.

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