Re: [ontolog-forum] Time expressions

[Simon Spero <sesuncedu@xxxxxxxxx>]

XSD durations can represent  any real number of seconds. 

iCalendar durations can represent any integral number of seconds. 

  

On Thu, Mar 27, 2014 at 3:32 PM, Toby Considine <Toby.Considine@xxxxxxxxx> wrote:

Thanks John.

That was sublime.

Moving to the mundane:

ISO 8601 specifies the _expression_ of time, including relative, absolute,
with or w/o time zones.
ISO 8601 specifies the _expression_ of intervals, that is duration of time,
including 1 year, two months, 3 weeks, and 7 minutes.

iCalendar [RFC 5545] (and therefor XCal and WS-Calendar) only allows a
subset of the legal ISO 8601 durations.
XML only allows a subset of the legal ISO 8601 durations.
The subsets used by iCalendar and XML are not the same


tc

-----Original Message-----
From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx
[mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx] On Behalf Of John F Sowa
Sent: Wednesday, March 19, 2014 9:23 AM
To: ontolog-forum@xxxxxxxxxxxxxxxx
Subject: Re: [ontolog-forum] Time expressions

In my previous note in this thread, I included a note from Corpora list that
had some useful references on temporal expressions in NL texts.

I also sent an excerpt from that note to Corpora list with the URL of the
60-page "Catalog of Temporal Theories" by Pat Hayes.  My note included Pat's
final disclaimer and my summary:

JFS
> In short, don't expect, imagine, or hope that any particular
> formulation is, will be, or can be the final definitive word on time.

Adam Kilgarriff replied:
> even intermittently :)

Adam runs a business that processes large volumes of "Big Data" in NL form,
he has taught "master classes" in lexicography, and he's the author of the
article "I don't believe in word senses":

    http://www.kilgarriff.co.uk/Publications/1997-K-CHum-believe.pdf

Observation:  In discussing ontology, we must always distinguish the kinds
of applications.  The requirements for Big Data, airplane design, buying
stuff on Amazon, and answering Jeopardy! questions are totally different
from each other and from the theorem provers that computer scientists
publish papers about.

I like theorem provers, and I believe they can be useful.  But it's
important to ask when, where, why, how -- and by whom and for whom.

John

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