At 9:12 PM -0500 1/22/08, creed@xxxxxxxxxxxxxxxxxx wrote:
>If the forum is going to begin discussing how to express time and the
>semantics of time, I would seriously suggest the group look at the various
>ISO standards and related IETF standards that dal with expressing time. If
>you are interested in expressing time intervals etc, I would suggest you
>look at the OGC Observations and Measurements standard. (01)
Are these available on-line? Pointers? (02)
Pat (03)
>Any questions, please let me know.
>
>Regards
>
>Carl Reed
>OGC
>
>> Dear John,
>>
>> I'm glad you brought it up, because it was on my mind too:
>>
>>> Re PTim: I realize that calling an interval a point is problematical.
>>> But in anything that has to do with the physical world, there is no
>>> way to specify a true point. Perhaps a better term would be "grain
>>> in time", abbreviated "Grit".
>>
>> I think one of the constant challenges of ontology is to differentiate
>> between common practice ways of representing things, e.g.
>>
>>> There are so many hard problems, it's hard to say which are harder.
>>> But the idea of taking the least significant digit as the criterion
>>> for implicit granularity is fairly common for experimental data
>>> (unless some explicit margin of error is stated).
>>
>> And what they really are, i.e. in this case an interval or period. Now
>> there is, in my mind, nothing wrong with naming an interval 14th Jan
>> 2008, but it needs to be understood that it has a start time of midnight
>> at the start of the day, and an end time of midnight at the end of the
>> day, and that it is not in any sense a point in time.
>>
>> All this for me is independent of whether time is ultimately granular
>> or continuous. Ultimately this only means at what point we can not longer
>> tell whether one event happened before another.
>>
>>
>> Regards
>>
>> Matthew West
>> Reference Data Architecture and Standards Manager
>> Shell International Petroleum Company Limited
>> Registered in England and Wales
>> Registered number: 621148
>> Registered office: Shell Centre, London SE1 7NA, United Kingdom
>>
>> Tel: +44 20 7934 4490 Mobile: +44 7796 336538
>> Email: matthew.west@xxxxxxxxx
>> http://www.shell.com
>> http://www.matthew-west.org.uk/
>>
>>
>>> -----Original Message-----
>>> From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx
>>> [mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx]On Behalf Of
>>> John F. Sowa
>>> Sent: 21 January 2008 17:48
>>> To: [ontolog-forum]
>>> Subject: Re: [ontolog-forum] Time representation
>>>
>>>
>>> Pat,
>>>
>>> The position I most strongly advocate is not a specific ontology,
>>> but a framework of conventions for organizing a multiplicity
>>> of special cases (not necessarily consistent with one another),
>>> making the implicit relationships explicit, and providing tools
>>> and guidelines for mixing and matching. The lattice of theories
>>> is an example. Robert Kent's IFF is a much more ambitious example.
>>>
>>> I would recommend a fairly simple framework for starters, since
>>> there's a danger of freezing half-baked ideas before they're fully
>>> baked. (RDF, for example, was hardly out of the oven before
>>> Tim Bray tried, unsuccessfully, to pull it back in.)
>>>
>>> > Do you have any granularity axioms? That is one of the hardest
>>> > ontological problems, in my experience.
>>>
>>> There are so many hard problems, it's hard to say which are harder.
>>> But the idea of taking the least significant digit as the criterion
>>> for implicit granularity is fairly common for experimental data
>>> (unless some explicit margin of error is stated).
>>>
>>> Re PTim: I realize that calling an interval a point is problematical.
>>> But in anything that has to do with the physical world, there is no
>>> way to specify a true point. Perhaps a better term would be "grain
>>> in time", abbreviated "Grit".
>>>
>>> John
>>>
>>> PS re HTML email formats: Your note of 11:18 was in a readable font
> >> for Thunderbird, but your note of 11:37 appeared in a tiny, tiny font.
>>> I had to increase the font size by two steps to make it the same as
>>> the previous note. But then the fonts for all other notes were too
>>> big, and I had to decrease the default by two steps.
>>>
>>> At least each of your notes was entirely in one font size. I've
>>> received some email in which each paragraph was in a progressively
>>> smaller font. That's why I hate HTML email.
>>>
>>>
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