Semantic Web Technologies

RDF

Uniform Resource Identifier References (URIrefs):

Used as namespace references.

machine-processable identifiers for identifying a subject, predicate, or object in a statement without any possibility of confusion with a similar-looking identifier that might be used by someone else on the Web (RDF Primer)

Example: http://www.somepage.org/stuff#thisthing

(URI, optionally suffixed with "#" and a fragment identifier.)

Statement representation

Subjects and predicates must be represented with URIrefs.

Objects may be represented with:

• URIrefs (http://www.anysite.org/anypage#anyitem)
• Literals ("14A9")
• Typed literals ("14A9" interpreted with http://www.w3.org/2001/XMLSchema#hexBinary)