This mail is publicly posted to a distribution list as part of a process
of public discussion, any automatically generated statements to the
contrary non-withstanding. It is the opinion of the author, and does not
represent an official company view. (01)
As an aside from my discussion with Pat Hayes on geometry and topology,
I wondered whether the discussion on time was actually discussing two
*ontologies. (02)
Firstly, a time *topology, which is invariant under transformation and
scaling, and covers concepts like before, during, recurring. (03)
Secondly a time *geometry, which covers concepts like date, interval,
accuracy. (04)
Would separating these out into separate system, and then defining
*functions relating the time *geometry to the time *topology make the
*ontology more straightforward? (05)
And also, is there a good term for *ontology, meaning an ontology
constructed from a particular viewpoint, and carefully leaving a
different viewpoint to construct its own *ontology, but which can/may at
a later point be imported into some unifying world theory? And are there
good guidelines for making such design decisions? (06)
Sean Barker
BAE SYSTEMS - Advanced Technology Centre
Bristol, UK
+44(0) 117 302 8184 (07)
BAE Systems (Operations) Limited
Registered Office: Warwick House, PO Box 87, Farnborough Aerospace
Centre, Farnborough, Hants, GU14 6YU, UK
Registered in England & Wales No: 1996687 (08)
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