Leo, (01)
In your descriptions of both strong and weak taxonomy models, do you see
either as being supportable as a proper tree structure (i.e.- one parent
per child node), or as a more general acyclic directed graph (multiple
parents possible per child node)? (02)
Also, considering the parent-child relationship, do you see limitations on
the ability for a computational system to reason over such a model, if the
parent-child relationships are intensional vs. extensional (in terms of the
resulting children from the defined relationship)? (03)
Chuck Turnitsa (04)
Charles Turnitsa
Lab Manager/Project Scientist
Virginia Modeling, Analysis & Simulation Center
Old Dominion University Research Foundation
7000 College Drive
Suffolk, Virginia 23435
(757) 638-6315 (voice)
(757) 686-6214 (fax)
cturnits@xxxxxxx (05)
> Date: Wed, 1 Mar 2006 12:08:47 -0500
> From: "Obrst, Leo J." <lobrst@xxxxxxxxx>
> Subject: RE: Re:[ontac-forum] Future directions for ontologiesand
> terminologies (06)
> Denise,
>
> But WordNet does have hypernymy (parent or broader-than) and hyponymy
> (child or narrower-than) links between words (synsets), no? So it's
> very close to a thesaurus. You are right that you cannot use a
> thesaurus for concepts or describing meaning, since thesauri are about
> term relationships. I think your rich domain thesaurus is probably a
> conceptual model.
>
> The usual range of semantic models I characterize as, from less to more
> expressive semantics: taxonomy, thesaurus, conceptual model, logical
> theory, with the addendum that taxonomies are weak (arbitrary
> parent-child relation) or strong (narrowerThan or subClass parent-child
> relations, the former for terms as in the taxonomic backbone of a
> thesaurus, the latter for concepts in a conceptual model or logical
> theory's taxonomic backbone). Conceptual models can be viewed as weak
> ontologies; logical theories as strong ontologies, with the primary
> distinction being that logical theories are expressed in a knowledge
> representation language that is logic-based, hence supports machine
> semantic interpretation, and conceptual models do not.
>
> You can review my recent Ontolog 2 part briefing (Jan. 12 & 19, 2006)
> on these distinctions (using the Ontology Spectrum) "What is an
> Ontology: The Range of Semantic Models" at:
> http://ontolog.cim3.net/cgi-bin/wiki.pl?ConferenceCall_2006_01_12,
> i.e.:
>
> http://ontolog.cim3.net/file/resource/presentation/LeoObrst_20060112/On
> tologySpectrumSemanticModels--LeoObrst_20060112.ppt.
>
> Also an audio track of both talks are available at:
>
> Part 1, Jan. 12, 2006, 1 Hour 40 Minutes, Recording File Size: 23.4 MB
> (in mp3 format):
> http://ontolog.cim3.net/file/resource/presentation/LeoObrst_20060112/On
> tologySpectrumSemanticModels--LeoObrst_Recording-2473397-874999_2006011
> 2.mp3
>
> Part 2, Jan. 19, 2006, 1 Hour 42 Minutes, Recording File Size: 23.9 MB
> (in mp3 format):
> http://ontolog.cim3.net/file/resource/presentation/LeoObrst_20060112/On
> tologySpectrumSemanticModels--LeoObrst_Recording-2496706-401969_2006011
> 9.mp3
>
> Thanks,
> Leo
>
> _____________________________________________
> Dr. Leo Obrst The MITRE Corporation, Information Semantics
> lobrst@xxxxxxxxx Center for Innovative Computing & Informatics
> Voice: 703-983-6770 7515 Colshire Drive, M/S H305
> Fax: 703-983-1379 McLean, VA 22102-7508, USA
> (07)
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