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Re: [ontolog-forum] Ontology similarity and accurate communication

To: "'[ontolog-forum] '" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: "Patrick Cassidy" <pat@xxxxxxxxx>
Date: Thu, 20 Mar 2008 15:35:24 -0400
Message-id: <0ba501c88ac1$8b3ed090$a1bc71b0$@com>
  There is an axiom provide by you during this thread which I would like to
clarify:    (01)

    >> (forall (x (t Time) P)(iff (P x t)(P (x during t)) ))    (02)

 I have not seen the two different syntactic expressions:
    (P x t)   and  (P (x during t))
 Used together before.  The first suggests a 3D perspective, and the second
suggests a 4D perspective.    (03)

  How would you describe the type that "x" belongs to?    (04)

  The way it is used in those expressions, it looks a lot like the
"dimension neutral object" that I suggested as a way of providing both 3D
and 4D perspectives in the same ontology.  In my case, however, I did not
use the (x during t) expression, but created a type "TimeSlice" so that
time-slices (any temporal length) of 4D objects could be expressed in an OWL
formalism.    (05)

   Is there a documentation somewhere that additionally explains the
intended meaning and use of that type (of which "x" is an instance)?    (06)

Pat    (07)

Patrick Cassidy
cell: 908-565-4053
cassidy@xxxxxxxxx    (08)

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