> Message: 7
> Date: Wed, 11 May 2011 11:25:19 -0700
> From: Thomas Russ <[hidden email]>
> To: User support for the Protege-OWL editor
> <[hidden email]>
> Subject: Re: [protege-owl] more on prefixes
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
> On May 11, 2011, at 10:52 AM, Alexander Nakhimovsky wrote:
>> I would like to use Protege to create a simple Turtle file that does
>> the following:
>> declare two prefixes, dc: for Dublin Core Elements and foaf: for
>> friend of a friend
>> create a class, eduOrganization that is a subclass of
>> create an object property, startTime, to indicate when an
>> eduOrganization was founded
>> specify that its domain is dc:Date
>> After a long time trying I still don't know how to create such a file
>> in Protege. In particular, when one declares a prefix in RC1, the
>> program doesn't notice this: if you try to save, there's nothing to
>> save; if you Save As... the namespace declaration is not saved.
>> Does this all mean that in order to use an ontology one has to import
>> it in its entirety?
> Well, the problem that you get if you don't import the ontology is
> that any information about the meaning of the names in that ontology
> is not available. The name is just a name.
> So, for example, if you want to create a subclass of
> foaf:Organization, but haven't imported the foaf ontology, then there
> is no definition of foaf:Organization as an owl:Class. Now, in this
> case, an OWL system could infer that foaf:Organization must be an
> owl:Class based on context, but that information isn't explicit
> anywhere. And there wouldn't be any inferences available about, say,
> the superclasses of foaf:Organization.
> Similarly for dc:Date. There is no information about what the meaning
> of that term is without importing the ontology.
> So, you really do generally need to import an ontology -- or at least
> a extract of an ontology -- in order to use the terms and have their
> meanings present.
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> End of protege-owl Digest, Vol 58, Issue 25