On Oct 23, 2012, at 5:59 PM, William Frank wrote: (01)
> I seek some enlightenment:
>
> Looking at this hierarchy, while it is questionable in many ways, I find it
>troubling that a place is a kind of thing, yet a date/time is a "data type,"
>and not a kind of thing. (02)
The date/time is information about the thing. The thing, in this case, is a
time or time-interval. Note that the same actual time might have different
date/times in different temporal coordinate systems, eg the Islamic calendar
and the Mecca timezone vs. the Gregorian calendar and the NYC timezone. (03)
Pat (04)
>
> I sort of thought space-time was somehow unified. surely more than a
>datatype, such as number, which can be used to identify a location in space
>and time, and yet different from "things."
>
> I can only hope there is some practical reason for this I do not understand,
>as I can more easily guess for many of the other classifiers and their
>otherwise dubious organization.
>
> Wm
>
> On Tue, Oct 23, 2012 at 5:58 PM, John F Sowa <sowa@xxxxxxxxxxx> wrote:
> On 10/23/2012 2:27 PM, Deborah MacPherson wrote:
> > Curious where this list of facilities came from and
> > how they came to be organized this way.
>
> I just selected a few random examples from the Schema.org hierarchy
> to illustrate the discussion:
>
> http://www.schema.org/docs/full.html
>
> This hierarchy was defined by the consortium founded by Google,
> Microsoft (Bing), and Yahoo.
>
> R. V. Guha was the person from Google who presented a talk on Schema.org
> in the Ontolog series. Guha had been the associate director of Cyc in
> the early 1990s. He co-authored the book on Cyc with Doug Lenat (1991).
>
> So Guha was certainly familiar with the methods used in Cyc, and he
> made some major contributions to them. In particular, Guha's PhD
> dissertation (for which John McCarthy was the thesis adviser and
> Ed Feigenbaum was on the committee) was about reorganizing the Cyc
> ontology in microtheories.
>
> Guha later went to Apple and then to Netscape, where he worked
> with Tim Bray to develop RDF. He also worked with Pat Hayes
> to define the logic base (LBase) for RDF. He worked at IBM
> research for a while in the early 2000s, and he is now at Google,
> where he is working on Schema.org.
>
> So I would assume that the current Schema.org hierarchy was at least
> influenced by Guha. I don't know all the reasons why he would have
> designed it that way, but I do know that one reason why Guha designed
> RDF is that he believed that Cyc was too complex. He didn't want to
> reject logic, but he wanted to find a simpler foundation that could
> grow into a richer system.
>
> And by the way, Guha said that he would have preferred LISP notation
> for representing triples instead of XML notation. That may be one
> reason why Google is emphasizing JSON for Schema.org -- JSON is
> basically LISP with square brackets and curly braces.
>
> John
>
> PS: If I were forced to bet on a W3C design vs a Google design
> as the likely direction for the future, I'd lean toward Google.
> But Google has quite a few abandoned designs on their garbage
> heap, and so does the W3C.
>
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