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One Page Intro To RDF
For those familiar with UML, the RDF data model can be described as follows:
RDF data consists of a set of (subject, predicate, object) triples called statements. There are two kinds of statements: those whose object is literal value (e.g. $2.75):
- KeyLimePie, price, $2.75
and those whose object is a Resource (e.g. KeyLimePie):
- PaulTrevithick, favoritePie, KeyLimePie
Resources are URI references. Subjects are Resources. Predicates are a special kind of Resource called a Property.
Literals are text strings with optional language identifiers and optional datatype identifiers. A literal with a datatype specifier is called a typed literal. Typed literals (especially when used with OWL) use most (though not quite all) of the XMLSchema types. Examples of typed literals are: "xsd:integer^^6" and "xsd:time^^06:00:00".