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CSE 428 Semantic Web Topics RDF

This document explores the differences between Turtle and RDF/XML formats in the context of semantic web technologies. It provides examples of how RDF is structured using both syntaxes, showcasing the representation of data and relationships among resources. With a focus on the FOAF (Friend of a Friend) vocabulary, the document illustrates how to define individuals, their attributes, and interconnections. Readers will gain insights into effective ways to model data within the RDF framework, helping them understand the nuances and applications of these serialization formats.

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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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