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Quick RDF Introduction Scott Streit

Quick RDF Introduction Scott Streit. Terminology – RDF Triple (Also the triple form used in SPARQL). RDF Triple ( Resource, Property, RDFNode ) Also shown as (subject, predicate, object) Resource must be a URI (it is a subject and is always an ‘object property’ in the database)

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Quick RDF Introduction Scott Streit

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  1. Quick RDF IntroductionScott Streit

  2. Terminology – RDF Triple (Also the triple form used in SPARQL) • RDF Triple • (Resource, Property, RDFNode) • Also shown as (subject, predicate, object) • Resource must be a URI (it is a subject and is always an ‘object property’ in the database) • Property is a link from the Resource to an RDFNode • The Property belongs to the Resource and references the RDFNode • Property is either a ‘standard’ RDF value or one defined by our ontology • RDFNode can be either • A Resource (object property) • A Literal (datatype property – sometimes referred to as a value) • (URI, URI, URI or Literal) • RDF Serialization Forms • XML – a few ways to express triples • NTriples – Generally preferred short-hand method • N3 – one complete triple per line

  3. Nodal View and Standard RDF Primitives Instances (A-Box) Ontology (T-Box) KMDEV:Stripes Mammal RDF:type Zebra … … RDFS:subClassOf RDF:label KMDev:Location ‘Stripes’ Zebra GeoLoc RDF:type KMDev:LocType KMDEV:LL 89N 84E …

  4. Other Topics • Reification – Knowledge about Knowledge • RDF RDFS • Famous Ontologies • Dublin Core (Metadata) • FOAF – Friend of a friend • vCard – Electronic Business Cards • SUMO, Dolce, CYC/UMBEL • Wordnet • Semantics on the Internet • Twine – built on RDF • Google “Cancer” -> Searches related to Cancer • Wolfram Alpha • Evri • SPARQL – Semantic Protocol and RDF Query Language

  5. Other Details • Ontology building tools • Jena – in code • Protégé • TopBraid Composer • Swoop, … • Inference/reasoners • Proper subset is strongest capability • Closed world reasoning is not an option for most real problem spaces • Datatype vs Object properties • Domain and Range • Sharing • RDF Dump • Linked Data • SPARQL Endpoint

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