W3C home > Mailing lists > Public > public-openannotation@w3.org > January 2013

Re: New Draft comments: Multiplicity

From: Paolo Ciccarese <paolo.ciccarese@gmail.com>
Date: Mon, 28 Jan 2013 16:46:33 -0500
Message-ID: <CAFPX2kAyjtXSaBL2SF-pJQ_x_mo-78CmkELe2=ku4w-Hcg-a6g@mail.gmail.com>
To: Antoine Isaac <aisaac@few.vu.nl>
Cc: public-openannotation <public-openannotation@w3.org>
This is to have an idea of what can be done with some axioms and properties:

On Mon, Jan 28, 2013 at 4:43 PM, Paolo Ciccarese

>>>  As a way to alleviate the issue, and also have better matching between
>>>> OA
>>>> and RDF, I'd suggest the following "bridging" axioms:
>>>> rdf:first rdfs:subPropertyOf oa:item .
>>>> oa:item  owl:propertyChainAxiom  ( rdf:rest  oa:item ) .
>>>> It think this would provide a sound basis on which the oa:item
>>>> statements
>>>> from Fig 4.3 could be derived.
>>>> [...]
>>> While a great idea, I'm not sure that we can make assertions like this
>>> about rdf:first?
>>> My preference, especially at this stage, would be to leave it alone
>>> and add an editors note that ordering in RDF is inherently problematic
>>> and future specifications may require changes to the mapping.  This
>>> would also give an opportunity to explain why we introduce the classes
>>> rather than just using Alt, Bag and List directly.
>> I'm ok for the editor note, but then I would use it as an argument for
>> using rdf:List directly. The note can say that this would be reverted if
>> RDF drops or changes lists (which btw I think it won't do: Bag, Seq and Alt
>> are slightly questionable classes, but lists are used in many places, e.g.,
>> OWL).
>> By the way you could treat my suggestion for the axioms "bridging"
>> between rdf:first/rdf:rest and oa:item. Perhaps re-expressing it as an
>> algorithm to obtain oa:item statements from rdf:first/rdf:rest ones. It can
>> be useful to have a (semi-)formal spec in the document. After all, whether
>> it fits OWL(2-DL) or not does not matter much: data producers will have to
>> implement these rules to obtain the desired oa:item statements!
> There is plenty of existing work in that area. Including work I've
> personally done.
> I would make sure to not re-invent the wheel on ways of representing lists
> in OWL.
> I would postpone this to a later time rather than rush it now.
> Paolo

Dr. Paolo Ciccarese
Biomedical Informatics Research & Development
Instructor of Neurology at Harvard Medical School
Assistant in Neuroscience at Mass General Hospital
+1-857-366-1524 (mobile)   +1-617-768-8744 (office)

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Received on Monday, 28 January 2013 21:47:00 UTC

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