Re: Not all properties are show in dcterm ontology

This is a bit tricky because I suspect that the OWL api is trying to be 
forgiving here.  I think that the short story is that dublin core is not 
an OWL 2 ontology.  While I haven't done a complete check, I think that 
an OWL 2 compliant parser [2] should reject dublin core as an import.  
This doesn't mean that an OWL 2 ontology cannot use the vocabulary but 
it does suggest that an import statement should import a dl-compliant 
version of the ontology.

I think that the latest version of the dublin core in rdf can be found 
here [1].  I did a search through it and found that it only used the owl 
vocabulary once to state that the property

            http://purl.org/dc/terms/creator


is equivalent to the property

           http://xmlns.com/foaf/0.1/maker


In particular, there are no declarations of data properties or of object 
properties.  In addition, with the lack of OWL vocabulary, it is hard to 
see how an OWL 2 compliant parser [2] could meet the requirement at the 
end of section 3 of [2] which says " At the end of this process, the 
graph/G//must/be empty.".

The OWL api is trying to be helpful by not rejecting the ontology.  But 
many of the triples in the ontology are ambiguous and can be interpreted 
in more than one way.  If we are out of spec as I think, then it is not 
clear what the OWL api should be showing.

My advice would be to use the vocabulary but not the rdf import.  There 
is at least one attempt to make a dl-version of dublin core [3] but I am 
not sure of its quality.  (The obi ontology imports this so this might 
be a positive indicator.) Also, if you like, you can use the vocabulary 
without importing anything.

-Timothy


[1] http://dublincore.org/2008/01/14/dcterms.rdf
[2]http://www.w3.org/TR/2009/REC-owl2-mapping-to-rdf-20091027/#Mapping_from_RDF_Graphs_to_the_Structural_Specification
[3]http://protege.stanford.edu/plugins/owl/dc/protege-dc.owl


On 10/28/2012 05:53 AM, Uri Shani wrote:
> Hi,
> I have loaded the dcterm ontology from the network, yet when browsing 
> its resources, I cannot see all the data properties.
> Specifically: I found dcterm:title, but not dcterm:description
>
> Here is what I have done:
> I opened an ontology, clicked on the + in "Direct Imports" on the 
> Active Ontology tab.
> Than, selected second bullet for loading from a location on the web.
> Than, picked http://purl.org/dc/terms/.
> Using Protege 4.1.
> Many thanks,
> - Uri
>
>
>
> Regards,
>
> *Uri Shani, PhD*
> Research Staff Member
> SPRINT(lead), DANSE (tools-net lead) Projects
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