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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

CSE 428Semantic Web TopicsRDF

Jeff Heflin

Lehigh University


Turtle vs rdf xml
Turtle vs. RDF/XML

Turtle:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> [email protected] 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>


Default namespaces
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>


Using xml entities
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


Nesting descriptions
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>


Typed nodes in rdf xml
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


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/


Rdf schema example
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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