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In January 2005, RFC 3986 makes this extension of the definition completelety explicit:
''... abstract concepts can be resources, such as the operators and operands of a mathematical equation, the types of a relationship (e.g., "parent" or "employee"), or numeric values (e.g., zero, one, and infinity).''
== Technical issues ==
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=== Using HTTP URIs to identify abstract resources ===
Using URLs, and singularly HTTP URIs, to identify abstract resources, such as classes, properties or other kind of concepts, is a frequent practice, for example in RDFS or OWL [[Ontology (computer science) | ontologies]]. Since such URIs are associated with the HTTP protocol, the question arises of which representation should be get for such resources using this protocol, typically using a Web browser. The proposed answers to this difficult question have been very various. A possible and extreme answer has been "no representation at all". Current trend is to admit that some kind of representation, definition, or description of the resource should be made available for humans or computers as well.
==Social issues ==
=== Resource ownership ===
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In RDF, "anybody can declare anything about anything". Resources are "defined" by formal descriptions which anyone can publish, copy, modify and publish over the Web.
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