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Are they in the semiotic sense, arbitrary signs (chosen by convention, and not inherently meaningful)? The problem of namespace dereferencing is to make a sign inherently meaningful. Otherwise, they are simply systemic and can be replaced by any other sign system that provides an isomorphic functionality (ie, are keys or indexes). len From: Hutchison, Nigel [mailto:Nigel.Hutchison@s...] Further, the RDF Syntax spec requires that the properties namespace must not only be a label, but, in fact, must be a valid URL to an RDF Schema document (which defines what the property means, thus enabling dynamic understanding of a property). That's my understanding. Is it an incorrect understanding? Yes it is incorrect. One of the odd things about RDF is though it is full of URIs, RDF processing doesn't involve URI dereferencing. URIs are used like keys.
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