Is there an active ontology design discussion happening
somewhere? I would be interested in communicating about
some basic design issues, but also about some specific
issues regarding digital arts. There are many examples
of upper ontology structures, I would like to start from
the bottom up... taking some topics from the 'back of the
book index;' putting together some micro-ontologies and
then merging them and see where the structure leads.
Any comments? Any referrals to active discussions?
Professor Media Arts/Computer Music
CEMC - China Center for Electronic Music
Central Conservatory of Music
43 BaoJia Street
Beijing, China, 100031
From the OpenCyc documentation:
> #$Event events **COMMENT NOT REVIEWED** **GAFs NOT REVIEWED**
> An important specialization of #$Situation-Temporal and
> #$IntangibleIndividual (qq.v). Each instance of #$Event
> is a dynamic situation in which the state of the world
> changes; each instance is something one would say happens.
> Events are intangible because they consist of changes per
> se, not tangible objects that effect changes. Instances of
> #$Event should not be confused with instances of #$TimeInterval
> (q.v.). The temporal bounds of events are delineated by time
> intervals, but in contrast to events time intervals have no
> spatial extent.
I have a question regarding #$Event. I'm trying to differentiate
temporal things that are purely temporal (such as points in time,
start and end dates, time intervals, etc.) from both things that
exist (in time and space), and then events. Of cource, Cyc has a
fairly rich vocabulary for this, but when reading over the docs
for #$Event I note that it says (in that last sentence) that "in
contrast to events time intervals have no spatial extent" which
seems to imply that #$Events must have spatial extent, i.e., that
having spatial extent is the differentiating factor. This seems
strange, in that events include thoughts and other things that
don't have spatial extent.
Is there an easy differentiation between events and time intervals?
My understanding is that an event is a change in state in reality
that has a beginning and an ending time, but I don't see what marks
the difference between that and a simple time interval (or at least
I don't see how to easily state that).
Murray Altheim http://kmi.open.ac.uk/people/murray/
Knowledge Media Institute
The Open University, Milton Keynes, Bucks, MK7 6AA, UK .
US STATES OF TERROR ALERT