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2. RDF: Heart and Soul > 2.3. The Basic RDF Data Model and the RDF Graph

The Basic RDF Data Model and the RDF Graph

The RDF Core Working Group decided on the RDF graph—a directed labeled graph—as the default method for describing RDF data models for two reasons. First, as you’ll see in the examples, the graphs are extremely easy to read. There is no confusion about what is a subject and what are the subject’s property and this property’s value. Additionally, there can be no confusion about the statements being made, even within a complex RDF data model.

The second reason the Working Group settled on RDF graphs as the default description technique is that there are RDF data models that can be represented in RDF graphs, but not in RDF/XML.

Tip

The addition of rdf:nodeIDs, discussed in Chapter 3, provided some of the necessary syntactic elements that allow RDF/XML to record all RDF graphs. However, RDF/XML still can’t encode graphs whose properties (predicates) cannot be recorded as namespace-qualified XML names, or QNames. For more on QNames, see XML in a Nutshell, Second Edition (O’Reilly).


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