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CSE 428 Semantic Web Topics RDF

CSE 428 Semantic Web Topics RDF. Jeff Heflin Lehigh University. Turtle vs. RDF/XML. Turtle:

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CSE 428 Semantic Web Topics RDF

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  1. CSE 428Semantic Web TopicsRDF Jeff Heflin Lehigh University

  2. Turtle vs. RDF/XML Turtle: @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .@prefix foaf: <http://xmlns.com/foaf/0.1/> .<http://www.yahoo.com/~jdoe#jane> foaf:name "Jane Doe" ;foaf:knows http://www.yahoo.com/~jsmith#john . RDF/XML: <rdf:RDFxmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"xmlns:foaf="http://xmlns.com/foaf/0.1/"> <rdf:Descriptionrdf:about="http://www.yahoo.com/~jdoe#jane"> <foaf:knowsrdf:resource="http://www.yahoo.com/~jsmith#john" /> <foaf:name>Jane Doe</foaf:name> </rdf:Description> </rdf:RDF>

  3. Default Namespaces • <rdf:RDFxmlns="http://xmlns.com/foaf/0.1/"xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><rdf:Descriptionrdf:about="http://www.yahoo.com/~jdoe#jane"> <knowsrdf:resource="http://www.yahoo.com/~jsmith#john" /> <name>Jane Doe</name> </rdf:Description> </rdf:RDF>

  4. Using XML Entities • <!DOCTYPE rdf:RDF [ • <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#">] > • <rdf:RDFxmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" • xmlns:foaf="http://xmlns.com/foaf/0.1/" > • <rdf:Descriptionrdf:about="http://www.aol.com/~jdoe"> • <foaf:agerdf:datatype="&xsd;integer">30</foaf:age> • </rdf:Description> • </rdf:RDF> Resolves to:http://www.w3.org/2001/XMLSchema#integer

  5. Nesting Descriptions • <rdf:RDFxmlns="http://xmlns.com/foaf/0.1/"xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><rdf:Descriptionrdf:about="http://www.aol.com/~jdoe"> • <foaf:name>Jane Doe</foaf:name> • <foaf:knows> • <rdf:Descriptionrdf:about="http://www.aol.com/~jsmith"> • <foaf:name>John Smith</foaf:name> • </rdf:Description> • </foaf:knows> • </rdf:Description> • </rdf:RDF>

  6. Typed Nodes in RDF/XML • <rdf:RDFxmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" • xmlns:foaf="http://xmlns.com/foaf/0.1/"> • <rdf:Descriptionrdf:about="http://www.yahoo.com/~jdoe#jane"> • <rdf:typerdf:resource="http://xmlns.com/foaf/0.1/Person" /> • <foaf::name>Jane Doe</foaf:name> • </rdf:Description> • </rdf:RDF> Jane is an instance of Person • <rdf:RDFxmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" • xmlns:foaf="http://xmlns.com/foaf/0.1/"> • <foaf:Personrdf:about="http://www.yahoo.com/~jdoe#jane"> • <foaf::name>Jane Doe</foaf:name> • </foaf:Person> • </rdf:RDF> Shorthand for the same thing

  7. RDFa • <html xmlns="http://www.w3.org/1999/xhtml" • prefix="bibo: http://purl.org/ontology/bibo/ • dc: http://purl.org/dc/terms/"> • <head> • <title>Books by Marco Pierre White</title> • </head> • <body> • I think White's book • '<span about="urn:ISBN:0091808189" typeof="bibo:Book" • property="dc:title">Canteen Cuisine</span>' • is well worth getting since although it's quite advanced stuff, he • makes it pretty easy to follow. You might also like • <span • about="urn:ISBN:1596913614" • typeof="bibo:Book" • property="dc:description" • >White's autobiography</span>. • </body> • </html> Declare namespace prefixes This item is of type Book, and has title “Canteen Cuisine” This item is of type Book, and has description “White’s autobiography” Example from http://www.w3.org/TR/rdfa-syntax/

  8. RDF Schema Example <rdf:RDFxml:base="http://example.org/univ-ont#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"xmlns:univ="http://example.org/univ-ont#"> <rdf:Propertyrdf:about="#teaches"> <rdfs:domainrdf:resource="#Professor" /> <rdfs:rangerdf:resource="#Course" /> </rdf:Property> <univ:Personrdf:about="#heflin" > <univ:teachesrdf:resource="#cse428" /> </univ:Person> </rdf:RDF> rdf:Property rdf:type rdfs:domain Professor teaches heflin cse428 teaches Course rdfs:range

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