Good point, and maybe worth discussing on the call tomorrow (if there’s time). It strikes me that, like almost all things in vocabulary, you can never force semantic bindings. If someone wants to derive their own notion of Person from Entity, you can’t stop them. So it’s only if they want shared semantics that they would be incented to derive from Higgins Person.
=Drummond
From: higgins-dev-bounces@xxxxxxxxxxx [mailto:higgins-dev-bounces@xxxxxxxxxxx] On Behalf Of Jim Sermersheim
Sent: Wednesday, July 09, 2008 10:29 PM
To: 'Higgins (Trust Framework) Project developer discussions'
Subject: RE: [higgins-dev] Questions wrt HOWL 1.1
I was thinking it meant that too until I read:
>And if so, does it mean that one could query for persons using http://www.eclipse.org/higgins/ontologies/2008/6/higgins#Person across all context providers?
>>Yes.
Maybe that's not actually saying anything more than what you just said.
Still isn't it overly prescriptive to say that everyone's notion of a person and group must adhere to the higgins notion (or a subtype thereof)?
>>> "Drummond Reed" <drummond.reed@xxxxxxxxxxxx> 07/09/08 11:11 PM >>>
Jim, I am not the HOWL expert at all, but my understanding of what Paul is saying is that a CP only need to support (i.e., use or extend) the HOWL notion of Person or Group if it needs to represent people or groups. So a CP that only exposes hardware or software resources might only need Entities and Attributes.
=Drummond
From:
higgins-dev-bounces@xxxxxxxxxxx [mailto:higgins-dev-bounces@xxxxxxxxxxx]
On Behalf Of
Jim Sermersheim
Sent:
Wednesday, July 09, 2008 9:56 PM
To:
higgins-dev
Subject:
Re: [higgins-dev] Questions wrt HOWL 1.1
Does anyone else find this a bit overbearing? Why do we want to prescribe that all CP's support our notion of a Person and Group? Shouldn't we have different profiles for different kinds of CPs?
If I deploy a CP that only exposes hardware resource, or software resources, why should it need to support a Person or Group?
>>> Paul Trevithick <paul@xxxxxxxxxxxxxxxxx> 07/07/08 8:17 PM >>>
Hi Rajalakshmi,
See inline below...
On 7/7/08 1:54 AM, "Rajalakshmi S Iyer" <iyer_rajalakshmi@xxxxxxxxxx> wrote:
Hi,
I have been going through HOWL 1.1 and here are some questions wrt the
same:
HOWL 1.1 defines new OWL classes like Person, Group etc. Is it necessary
that context providers who conform to HOWL must derive their
implementations of Persons and Groups from the HOWL 1.1 Person and
Group?
>> Yes they should.
And if so, does it mean that one could query for persons using
http://www.eclipse.org/higgins/ontologies/2008/6/higgins#Person across
all context providers?
>>Yes.
HOWL 1.1 does not seem to have the Attribute class that was present in
HOWL 1.0.
>> Perhaps you are referring to the higgins:attribute property that was present in HOWL 1.0 and was removed in HOWL 1.1. If so, this was done to allow developers to reuse existing properties from other (non-Higgins) OWL, and RDFS vocabularies. The higgins:attribute was used as the abstract super-property of all higgins-defined properties—but it was never used directly.
As I understood the CDM, all entities in the context must be
subClassOf &higgins;#Entity and all attributes must be a subPropertyOf
&higgins;#Attribute. Does this still hold?
>> The first half of what you say holds: all developer-defined Entities must subclass Entity (or one of its subclasses (e.g Agent, Person, Group or Organization and soon Policy). The second part is no longer true —there’s now nothing special about a higgins property (e.g. higgins:correation) vs. a property from some other namespace (e.g. foaf:knows).
Thanks,
Best regards,
Rajalakshmi Iyer
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