Creating a Semantic Web with Linked Data Todd King

??? SPASE FOAF On the Road to Semantics From Introducing Linked Data and the Semantic Web subject + predicate + object Dublin Core

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 does not provide semantics. Well known (shared) vocabularies are needed.

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.

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.

Background Information

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

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

RDF Statements SPASE RDF spase://SMWG/Person/Todd.A.King T12:34: Todd A. King Institute of Geophysics and Planetary Physics, University of California, Los Angeles Institute of Geophysics and Planetary Physics, University of California Los Angeles, Box , Los Angeles, CA <rdf:RDF xmlns:rdf=" xmlns:spase=" Todd A. King Institute of Geophysics and Planetary Physics, University of California, Los Angeles Institute of Geophysics and Planetary Physics, University of California Los Angeles, Box , Los Angeles, CA As Note: Slightly redacted and not using preferred namespaces in RDF version. Anything in XML can represented in RDF

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

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