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Re: dependency analysis of OWL axioms

From: Pavel Klinov <pavel.klinov@uni-ulm.de>
Date: Sat, 15 Nov 2014 21:17:01 +0100
Message-ID: <CAG5JQxW27ZTYas7j1BH-yRCf_K3eQ1fX-=W_0rkGgzAQW_Rd8Q@mail.gmail.com>
To: "Obrst, Leo J." <lobrst@mitre.org>
Cc: Pavel Klinov <pavel.klinov@uni-ulm.de>, Leila Bayoudhi <bayoudhileila@yahoo.fr>, "semantic-web@w3.org" <semantic-web@w3.org>
On Sat, Nov 15, 2014 at 9:01 PM, Obrst, Leo J. <lobrst@mitre.org> wrote:
> Pavel,
>
> How is a GCI not representable as a graph? I understand that all OWL ontologies can be represented as graphs, by definition into RDF graphs. Do you mean something else?

In you read my first reply to you carefully, you will see that I did
acknowledge it:

"Of course, one can invoke the OWL2RDF mapping and take the resulting
set of triples as a (kind of) graph, but I doubt it can be generally
useful."

But what are you going to do with that graph then?

Cheers,
Pavel

>
> Thanks,
> Leo
>
>>-----Original Message-----
>>From: Pavel Klinov [mailto:pavel.klinov@uni-ulm.de]
>>Sent: Saturday, November 15, 2014 5:08 AM
>>To: Obrst, Leo J.
>>Cc: Pavel Klinov; Leila Bayoudhi; semantic-web@w3.org
>>Subject: Re: dependency analysis of OWL axioms
>>
>>On Fri, Nov 14, 2014 at 10:51 PM, Obrst, Leo J. <lobrst@mitre.org> wrote:
>>> Thanks, Pavel.
>>>
>>> My question is about your comment:
>>>
>>> "OWL is quite a rich language and one can write very complex axioms which
>>don't look anything graph-like."
>>>
>>> I'd like to know your thoughts on this.
>>
>>For example, in OWL 2 DL one can take all (class) axioms and re-write
>>all that into a single long GCI.
>>
>>Cheers,
>>Pavel
>>
>>>
>>> Thanks!
>>> Leo
>>>
>>>>-----Original Message-----
>>>>From: Pavel Klinov [mailto:pavel.klinov@uni-ulm.de]
>>>>Sent: Friday, November 14, 2014 3:59 PM
>>>>To: Obrst, Leo J.
>>>>Cc: Leila Bayoudhi; semantic-web@w3.org
>>>>Subject: Re: dependency analysis of OWL axioms
>>>>
>>>>On Fri, Nov 14, 2014 at 5:42 PM, Obrst, Leo J. <lobrst@mitre.org> wrote:
>>>>> We had proposed this a number of years ago, but never had time to go
>>down
>>>>that path. More towards trying to infer "integrity constraints" dynamically
>>(yes,
>>>>OWL is Open World; integrity constraints are Closed World). Finding the
>>ripple
>>>>effect of deleting, adding, moving graph nodes that kind of corresponds to
>>>>"referential integrity" (i.e., structural) in the database world. Since all OWL
>>>>ontologies (the axioms) can be represented as graphs, it should be doable.
>>How
>>>>efficiently, I don't know.
>>>>>
>>>>
>>>>I'd be very, very cautious with statements like "OWL axioms can be
>>>>represented as graphs". In what precisely sense can they be
>>>>represented as graphs? OWL is quite a rich language and one can write
>>>>very complex axioms which don't look anything graph-like. Of course,
>>>>one can invoke the OWL2RDF mapping and take the resulting set of
>>>>triples as a (kind of) graph, but I doubt it can be generally useful.
>>>>
>>>>I can imagine that for some very specific tasks, like decomposition
>>>>(as in [1]), a graph-based representation of OWL axioms can be
>>>>helpful. But such use cases (and the corresponding representations)
>>>>tend to be pretty specific rather than generic.
>>>>
>>>>Cheers,
>>>>Pavel
>>>>
>>>>[1] Francisco Martín-Recuerda, Dirk Walther: Axiom Dependency
>>>>Hypergraphs for Fast Atomic Decomposition of Ontologies. Description
>>>>Logics 2014: 299-310
>>>>
>>>>>
>>>>> Thanks,
>>>>> Leo
>>>>>
>>>>>>-----Original Message-----
>>>>>>From: Leila Bayoudhi [mailto:bayoudhileila@yahoo.fr]
>>>>>>Sent: Friday, November 14, 2014 6:36 AM
>>>>>>To: semantic-web@w3.org
>>>>>>Subject: dependency analysis of OWL axioms
>>>>>>
>>>>>>Hello
>>>>>>I want to know if there is a tool or an approach realizing dependency
>>>>annalysis
>>>>>>of OWL 2 axioms.
>>>>>>Example:
>>>>>>by removing a subClassOf axioms , I want to know affected ones in the
>>>>>>ontology.
>>>>>>Or, can I do it manually by recognizing different types of axioms and
>>>>expecting
>>>>>>relations between them.
>>>>>>Thank you for answering me.
>>>>>>--398296598-735493131-1415964971=3759
>>>>>>Content-Type: text/html; charset=f-8
>>>>>>Content-Transfer-Encoding: quoted-printable
>>>>>>
>>>>>><html><body><div style="color:#000; background-color:#fff; font-
>>>>>>family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande,
>>sans-
>>>>>>serif;font-size:16px"><div>Hello</div><div>I want to know if there is a
>>tool
>>>>or
>>>>>>an approach realizing dependency annalysis of OWL 2
>>>>>>axioms.</div><div>Example:&nbsp;</div><div>by removing a subClassOf
>>>>>>axioms , I want to know affected ones in the ontology.</div><div>Or, can I
>>>>do it
>>>>>>manually by recognizing different types of axioms and expecting relations
>>>>>>between them.</div><div>Thank you for answering
>>>>>>me.</div></div></body></html>
>>>>>>--398296598-735493131-1415964971=3759--
>>>>>>
>>>>>
Received on Saturday, 15 November 2014 20:17:32 UTC

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