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Subject: Re: [regrep] Comments on "ebXML Registry Profile for Web Ontologies" draft 5
Farrukh Najmi wrote the following regarding the RegRep profile for OWL: >2.1.1 RDF Schema Features > >Suggest having a section prior to this that gives a table giving brief >descriptions of the namespaces used and their prefixes (e.g. rfd, rdfs) Be careful. The current section 2.1.1 lists only the elements of RDF and RDFS vocabularies particularly relevant to OWL. Even then, it could be slightly misleading to a non-Semantic Web person. The issues are: - Thing, Nothing and Individual are all in the owl vocabulary (namespace), - there is a different term for "Class" in each of RDFS and OWL vocabularies. However, the categorization is straight from OWL Overview (as the profile indicates), so there is surely a good reason for it. Also, the non-OWL vocabulary terms include prefixes, so they can still be distinguished. But perhaps you are just looking for a section something like: Semantic Web Languages upon which OWL is Layered OWL is one of a set of languages defined for the Semantic Web. It occupies the Ontology layer of an architecture sometimes referred to as the Semantic Web Layer Cake. This moniker alludes to the fact that each language in the architecture sits on top of another while exposing some of the layer below is is often seen of a wedding cake. OWL is situated in this architecture directly above the RDF Vocabulary Description Language: RDF Schema (RDFS) [1]. RDFS is a language for defining vocabularies or models with which to describe or categorize resources in the semantic web. RDFS, in turn, sits atop the Resource Description Framework (RDF) [2]. RDF provides a basic data model, XML based transfer syntax, and other basic tools. The whole Semantic Web stack itself then sits atop XML technologies which are used for identification and syntax definition. Namespace information for these languages is given in the table below. Semantic Web namespace table --------------------------------------------------------------- | Commonly used | Namespace URI Reference | | Prefix | | ---------------------------------------------------------------- | rdf | http://www.w3.org/1999/02/22-rdf-syntax-ns#| | rdfs | http://www.w3.org/2000/01/rdf-schema# | | owl | http://www.w3.org/2002/07/owl# | --------------------------------------------------------------- The following section discusses elements of OWL along with a few elements of RDF and RDFS which are most important to users of OWL. In this section Terms from RDF and RDFS vocabularies are distinguished from OWL terms by the inclusion of the appropriate prefix as given in the table above. [1] http://www.w3.org/TR/rdf-schema/ [2] http://www.w3.org/TR/rdf-concepts/ -Evan
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