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RE: representing non-state relationships in OWL

From: Hans Teijgeler <hans.teijgeler@quicknet.nl>
Date: Fri, 29 Dec 2006 22:23:48 +0100
To: "'C Haley'" <cands589@yahoo.co.uk>
Cc: <public-owl-dev@w3.org>, "'West, Matthew'" <matthew.west@shell.com>, "Sullivan, Jan" <jan.sullivan@informationlogic.co.uk>
Message-ID: <000001c72b8f$a4cd63b0$6c7ba8c0@hans>
Chris,
 
What about defining an OWL Class "Activity", then a subClassOf that called
"Meeting", and then the meeting you had in mind as an instance of it. Peter
then isHost of that instance of Meeting.
 
What still is missing is the temporal aspect. Our solution for that so far
found a cold shoulder in the OWL scene. That solution is to define "temporal
parts"[1]. The "temporal whole" of Peter is Peter between his birth and his
(future) death. A temporal part is a part of that whole-life time span in
which a certain fact is true. In this case there is a temporal part of Peter
that "isHost" of that particular meeting.
 
Regards,
Hans
 
[1] HYPERLINK
"http://www.tc184-sc4.org/wg3ndocs/wg3n1328/lifecycle_integration_schema.htm
l"http://www.tc184-sc4.org/wg3ndocs/wg3n1328/lifecycle_integration_schema.ht
ml , then select temporal_whole_part
 
PS I quote from that:
 
A <temporal_whole_part> is a <composition_of_individual> that indicates that
one <possible_individual> is a temporal part of another
<possible_individual>. The spatial extent of the temporal part is that of
the temporal whole for the period of the existence of the temporal part.
Relationships that apply to the whole <possible_individual> also apply to
the temporal parts of the <possible_individual>, except when the
relationships relate to the temporal nature of the whole. So if a
<possible_individual> is connected so are all its temporal parts, but being
a <whole_life_individual> is not inherited by its temporal parts.
NOTE Since <temporal_whole_part> is transitive (inherited from its
supertype) a hierarchy of temporal parts is possible, with a
<whole_life_individual> at the top.
EXAMPLE 1 The relation that indicates that an operating period of a pump is
a temporal part of the pump can be represented by an instance of
<temporal_whole_part>.
EXAMPLE 2 The relationship that indicates that the time period known as
March 1999 is part of the period known as 1st Quarter 1999 can be
represented by an instance of <temporal_whole_part>.
 
____________________
OntoConsult
Hans Teijgeler
ISO 15926 specialist
Netherlands
+31-72-509 2005
HYPERLINK "http://www.infowebml.ws/"www.InfowebML.ws 
HYPERLINK "mailto:hans.teijgeler@quicknet.nl"hans.teijgeler@quicknet.nl

   _____  

From: C Haley [mailto:cands589@yahoo.co.uk] 
Sent: Monday, September 11, 2006 20:23
To: public-owl-dev@w3.org
Subject: 


Hi
 
I’ve been reading through the various OWL documents and from what I’ve seen
it appears that OWL is very good at representing state information, either
of classes or individuals, but does not seem to allow for representing
non-state relationships.
 
For example I can use OWL to represent the concept ‘man’ as a class,
represent Peter as an instance of that class, and I can define a property
stateOfHealth, and the concept ill, and create a triple to say
stateOfHealth(Peter, ill). This is representing a fact which defines the
state of an instance.
 
But suppose I want to represent the fact that Peter hosted a meeting in the
office yesterday.
 
Even if I created an artificial property ‘toHost’ and a blank node as an
instance of the concept ‘meeting’, there is no way to attach the time and
location to the property.
 
Also I would want this property to derive from a URI representing the
concept of ‘hosting a meeting’, but the OWL syntax seems to require
properties to derive from other properties, not from a generic URI. So
clearly this is not the correct way to represent an action.
 
Can anyone tell me if there are any recommendations or documents describing
the preferred solution to this problem? Alternatively is this an area where
the existing OWL syntax/vocabulary is likely to be extended - is anyone
actively working on this issue at present? Are there any draft
recommendations in circulation?
 
Many thanks for any comments anyone can give.
 
Chris
 


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Received on Friday, 29 December 2006 21:24:16 GMT

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