Resource Description Framework (RDF)

• W3C Standard
• Resources are identified by unique identifiers (URIs)
• A RDF Store (or triple store) stores and retrieves Triples
• Each Statement consits of a Subject, Predicate and Object
• Uses the SPARQL Query Language
• Allows only one relation of the same type between nodes
• Allows only properties no nodes, not relationships, unlike LPG

Example

<http://example.org/person/1> :hasName “Allice". 
<http://example.org/person/2> :hasName “Bob".
<http://example.org/person/99> :hasName “Zach".
<http://example.org/person/1> :friendOf <http://example.org/person/2>.
<http://example.org/person/2> :friendOf <http://example.org/person/1>.
<http://example.org/person/2> :friendOf <http://example.org/person/99>.
<http://example.org/person/99> :friendOf <http://example.org/person/1>.