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#strings
Rdf Primer
The graph matters, not the notation
objects in RDF statements may be either URIrefs, or constant values (called literals) represented by character strings, in order to represent certain kinds of property values. Literals may not be used as subjects or predicates in RDF statements. [...] So, for example…
Why properties are named with URIrefs
RDF uses URIrefs as predicates in RDF statements. That is, rather than using character strings (or words) such as "creator" or "name" to identify properties, RDF uses URIrefs. Using URIrefs to identify properties is important for a number of reasons. First, it distinguishes the…