August 2009
Intermediate to advanced
456 pages
14h 8m
English
Content preview from Foundations of Semantic Web Technologies
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44 Foundations of Semantic Web Technologies
FIGURE 2.7: Representing auxiliary resources by blank nodes
available for subject and objects of RDF triples. Predicates (i.e. edges) must
alway be specified by URIs.
Blank nodes cannot be addressed globally by means of URIs, and they do
not carry any additional information within RDF graphs. Yet, the syntactic
serialization of RDF necessitates referring to particular blank nodes at least
in the context of the given document. The reason is that a single blank node
may appear as a subject or object in arbitrarily many triples. Therefore,
there must be a way for multiple triples to refer to the same blank no
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