>John Sowa:
>Yes indeed. Once we accept that point, the major issues to be
>discussed are: how big is the core, how many hubs will there be,
>how are all these things related to one another, and most of all,
>how do they relate to legacy systems, which will coexist with
>the brave new world for many years, if not decades.
>
>The biggest battles arise when people want to put their own pet
>theories into the core. (01)
John, is this not what you are now doing? (02)
> Murray Altheim, who has had a great deal
>of practical experience in these matters, listed the following
>five requirements for the core:
>
> > 1. a means of establishing [subject] identity
can you formulate this in English? (03)
> > 2. a facet, or property relation (04)
this seems to me to be entirely too general; do you mean: (05)
we distinguish between independent entities (such as people) and
dependent entities (such as color, weight, ...)? (06)
> > 3. the class-instance relation (07)
I propose that we distinguish classes and types (universals, kinds --
choose your favorite synonym); a class would then be the extension of a type (08)
> > 4. the superclass-subclass relation (which I later redefined
> > to be based on a mereological or collection basis, ala Cyc) (09)
the mereological (part-of) relation should be distinguished from the
supertype-subtype relation, which should be distinguished in turn
from the superclass-subclass relatin (010)
there is no type <things weighing greater than 10 grams on John Sowa's desk>
but there is a class (011)
> > 5. a means of expressing context (012)
This is the most difficult one. Let's go for the low-hanging fruit.
(Items 1.-4. are already fairly clearly worked out, after all.)
BS (013)
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