Re: [foaf-dev] FOAFs use of owl:AnnotationProperty

Hi Andrew,

On Wed, Jan 6, 2010 at 11:27 PM, Houghton,Andrew <houghtoa@...> wrote:
> I have a question about FOAF's use of owl:AnnotationProperty for DCMI properties.  It seems to me that if
I load the FOAF RDF, the SKOS RDF and some SKOS concepts that use DCMI properties into a triple store.  Any
DCMI properties in my SKOS concepts, specifically dc:description, dc:title and dc:date, will be
treated as owl:AnnotationProperty rather than properties because the FOAF RDF declares them as such
which is not what was intended.
>
> So my question is should FOAF be placing this constraint on other ontologies?

No, it shouldn't. In fact this is one of those features of OWL that
really annoyed me; that DC title etc was unusable in lots of DL
environments without telling the little lie that it's an annotation
propertly. Nevertheless there has been a lot of work in the OWL DC
scene and I didn't want to pointlessly diverge from compatibility, so
I grudgingly put those lies into the schema:

See the RDF/XML comments for detail -  http://xmlns.com/foaf/spec/index.rdf

  <!--  DC terms are NOT annotation properties in general, so we
consider the following
	claims scoped to this document. They may be removed in future
revisions if OWL tools become more flexible. -->
  <owl:AnnotationProperty
rdf:about="http://purl.org/dc/elements/1.1/description"/>
  <owl:AnnotationProperty rdf:about="http://purl.org/dc/elements/1.1/title"/>
  <owl:AnnotationProperty rdf:about="http://purl.org/dc/elements/1.1/date"/>

Since we make such minimalistic use of dc: there anyway, it would