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There are many examples for rdfs which use the following namespace

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

here is an example from w3c

<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:ex="http://example.org/stuff/1.0/"
         xml:base="http://example.org/here/">
  <rdf:Description rdf:ID="snack">
    <ex:prop rdf:resource="fruit/apple"/>
  </rdf:Description>
</rdf:RDF>

everything is ok, however, where rdf:Description rdf:ID are come from ? it should be from rdf namespace 

http://www.w3.org/1999/02/22-rdf-syntax-ns#

right?

I visited its link

http://www.w3.org/1999/02/22-rdf-syntax-ns#

but there is no rdf:Description or rdf:ID definitions.

even more, if we check for rdf:resource we can't find it, if it is from rdfs so why we did not write it like rdfs:Resource but w3c does not write it like this way, so where are these vocabularies are come frome?

is there any vocabulary used not mentioned in namespace vocabularies ?

andrefs
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Eng. Samer T
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1 Answers1

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rdf:ID is defined here in the RDF specs.

rdf:Description is used for any RDF node, be it a resource or an axiom (for example, in reification).

I'm not sure if this is enough to answer your question.

Ignazio
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    But note that these are used in the rdf/xml serialization, not as part of the RDF(s) vocabulary. E.g., you should never see "x rdf:type rdf:Description" or "x rdf:ID 67", even though other IRIs used in the same places in RDF/XML documents would produce the corresponding triples. – Joshua Taylor May 29 '16 at 17:09