[Draft Response for LC Comment 66:] AR1
Thank you for your message
on the OWL 2 Web Ontology Language last call drafts.
The Syntax document as of the date of your message stated
IRIs belonging to the rdf, rdfs, xsd, and owl namespaces constitute the reserved vocabulary of OWL 2. As described in the following sections, the IRIs from the reserved vocabulary that are listed in Table 3 have special treatment in OWL 2. All IRIs from the reserved vocabulary not listed in Table 3 constitute the disallowed vocabulary of OWL 2 and MUST NOT be used in OWL 2 to name entities, ontologies, or ontology versions.
This meant that the use of XML Schema datatypes that are not stated as usable in OWL 2 takes an ontology outside the scope of OWL 2 and thus attempts to go counter to XML Schema datatypes outside of those in the OWL 2 datatype map were not allowed in OWL 2 ontologies.
Recent changes to OWL 2, notably the division of OWL 2 syntax conditions into general conditions and OWL 2 DL conditions, have resulted in the relaxation of this rule, but still in a manner that appears to be in accord with your desires. Currently the Syntax document states
OWL 2 tools MAY support datatypes that are not listed in this section. [...] If such an extension includes datatypes from XML Schema [XML Schema Datatypes] not listed in the following sections, these SHOULD be supported in a manner consistent with their respective definition in XML Schema.
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Regards, Peter F. Patel-Schneider on behalf of the W3C OWL Working Group