24th Jan 2008
The Semantic Web: A Primer
by Edd Dumbill
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Pages: 1, 2
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Semantic Web Technologies (con’td) |
| the real value of RDF is the data model. |
It defines a
very simple data model of triples (subject, predicate, object), where
subject and predicate are URIs, and the object is either a URI or a
literal. With this simple model, objects and their properties may be
represented. |
RDF schemas differ somewhat from XML schemas (such as DTDs or W3C
XML Schemas) in that they do not define a permissible syntax but
instead classes, properties, and their interrelation: they operate
directly at the data model level, rather than the syntax level.
Scaled up over the Web, RDF schemas are a key technology, as they
allow machines to make inferences about the data collected from the
web. |
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