[tdwg-content] FOAF [SEC=UNCLASSIFIED]

Thu Nov 4 09:01:10 CET 2010

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- Pete

On Thu, Nov 4, 2010 at 12:21 AM, Paul Murray <pmurray at anbg.gov.au> wrote:

> There are a few pages about this.
>
> I am finding that the version available at
> http://xmlns.com/foaf/spec/index.rdf reads into Protege ok, and the HermiT
> reasoner does not complain about it - that being my usual test. The Owl
> consistency checker at http://www.mindswap.org/2003/pellet/demo.shtml highlights a couple of DL issues.
>
> * Some of the social properties (icq, msn chat, etc) are functional inverse
> datatype properties (if two persons have the same ICQ number, then they are
> the same person). The problem is that there is no general way to check data
> literals for equality (the OLW spec, for instance, supports fractions,
> floats and doubles). But these properties can be blithely ignored in most
> cases by simple dint of not using them.
> * name is declared to be a subtype of rdfs:label, but rdfs:label is an
> annotation property
> * the vocabulary does not import its dependencies, and so some declarations
> are implied
>
> Annotation properties are a bit of a bugbear. As far as I can tell, if
> something is an annotation property then it should only be used to describe
> vocabulary terms. The actual subject matter of an ontology should be
> described with regular properties. Thus, declaring name to be a subproperty
> of label is simply wrong: a thing's name is ontology, not vocabulary. The
> machine-level issue is that RDF can't tell the difference between the two,
> so OWL/RDF cannot behave according to the OWL specification in certain
> respects. But dcterms title and description fit the bill admirably, anyway.
>
> You can use the FOAF properties and classes without explicitly importing
> FOAF - you can just declare them. The OWL-DL incompatibilities are not
> serious. On the other hand ... you may dislike the fact that there are rules
> in FOAF at all. Maybe two different people happen to share an organisational
> ICQ address. FOAF at the moment would force you to create a Organisation or
> Group object for the team, and assign the ICQ address to that.
>
> And so yes, there are issues. The simple way to deal with it is to create
> TDWG terms mimicking the FOAF terms, declare them to be sameAs, and if that
> becomes unworkable then to break the equivalence.
>
> On 03/11/2010, at 3:55 PM, Bob Morris wrote:
>
> If machine reasoning is a goal, I would be wary of FOAF.  An OWL2-DL, or
> other OWL2 tractable reasoning profile, version remains a moving target, to
> the best of my knowledge.  The reasons that http://xmlns.com/foaf/spec/ is
> not subject to tractable reasoning are relatively manageable, but I can no
> longer find the Zimmerman proposal for a FOAF DL version referenced in the
> thread ending at
> http://lists.w3.org/Archives/Public/public-lod/2010Jul/0378.html
>
> Can someone point me at a DL version of FOAF and indication that it is
> actively under discussion somewhere?
>
> Thanks
>
>
> On Tue, Nov 2, 2010 at 10:38 PM, Richard Pyle <deepreef at bishopmuseum.org>wrote:
>
>>
>> I was thoroughly delighted to learn recently that FOAF uses terms in
>> almost
>> exactly the same way that I had structured my "Agents" data (right down to
>> the same exat terms, in most cases).  I plan to move forward with the FOAF
>> terms that are relevant (thanks to John W. for pointing this out to me at
>> TDWG).
>>
>> Rich
>>
>> > -----Original Message-----
>> > From: tdwg-content-bounces at lists.tdwg.org
>> > [mailto:tdwg-content-bounces at lists.tdwg.org] On Behalf Of Paul Murray
>> > Sent: Tuesday, November 02, 2010 4:18 PM
>> > To: Steve Baskauf
>> > Cc: tdwg-content at lists.tdwg.org
>> > Subject: Re: [tdwg-content] Comments on Cam's RDF practical
>> > details of recording a determination What is an Occurrence?
>> > [SEC=UNCLASSIFIED]
>> >
>> >
>> > On 29/10/2010, at 12:41 AM, Steve Baskauf wrote:
>> >
>> > > I think both dwc:recordedBy for the Occurrence and
>> > dcterms:created for some tokens should be provided.
>> > Depending on the situation, they might be different entities
>> > (I think John Wieczorek pointed this out in an earlier
>> > thread).  dwc:recordedBy is specifically supposed to be a
>> > person whereas I think dcterms:creator could be a person or
>> > an institution.
>> >
>> > Perhaps it might be worthwhile leveraging the FOAF vocabulary
>> > (Friend of a Friend). It's mainly meant for social
>> > networking, but nevertheless it does contain terms such as
>> > Person, Organisation, Group and Project. (Project is
>> > interesting - collection activities perhaps are FOAF Projects).
>> >
>> > The spec is here: http://xmlns.com/foaf/spec/
>> >
>> > We can envisage the day where, by following links on
>> > taxonomic web pages, you could eventually find an Author's
>> > current twitter address, or ask the semantic web "find me all
>> > specimens of genus Tandanus collected by teams affiliated
>> > with the university of NSW between 2005 and 2007".
>> >
>> >
>> >
>> >
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>>
>>
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>
>
>
> --
> Robert A. Morris
> Emeritus Professor  of Computer Science
> UMASS-Boston
> 100 Morrissey Blvd
> Boston, MA 02125-3390
> Associate, Harvard University Herbaria
> email: morris.bob at gmail.com
> web: http://bdei.cs.umb.edu/
> web: http://etaxonomy.org/mw/FilteredPush
> http://www.cs.umb.edu/~ram <http://www.cs.umb.edu/%7Eram>
> phone (+1) 857 222 7992 (mobile)
>
>
>
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-- 
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Pete DeVries
Department of Entomology
University of Wisconsin - Madison
445 Russell Laboratories
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TaxonConcept Knowledge Base <http://www.taxonconcept.org/> / GeoSpecies
Knowledge Base <http://lod.geospecies.org/>
About the GeoSpecies Knowledge Base <http://about.geospecies.org/>
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