18 messages in org.oasis-open.lists.topicmaps-commentRe: [topicmaps-comment] Mapping Topic...| From | Sent On | Attachments |
|---|---|---|
| W. Eliot Kimber | Jul 11, 2002 12:32 pm | |
| Lars Marius Garshol | Jul 11, 2002 1:00 pm | |
| Thomas B. Passin | Jul 11, 2002 4:12 pm | |
| Lars Marius Garshol | Jul 12, 2002 12:30 am | |
| Murray Altheim | Jul 12, 2002 4:12 am | |
| Lars Marius Garshol | Jul 12, 2002 5:14 am | |
| Thomas B. Passin | Jul 12, 2002 5:26 am | |
| Murray Altheim | Jul 12, 2002 5:28 am | |
| Lars Marius Garshol | Jul 12, 2002 5:35 am | |
| Lars Marius Garshol | Jul 12, 2002 5:37 am | |
| Lars Marius Garshol | Jul 12, 2002 5:44 am | |
| Murray Altheim | Jul 12, 2002 6:26 am | |
| W. Eliot Kimber | Jul 12, 2002 7:04 am | |
| Thomas B. Passin | Jul 12, 2002 6:09 pm | |
| Thomas B. Passin | Jul 12, 2002 6:25 pm | |
| Murray Altheim | Jul 15, 2002 4:40 am | |
| Thomas B. Passin | Jul 15, 2002 5:09 am | |
| Murray Altheim | Jul 15, 2002 6:16 am |
| Subject: | Re: [topicmaps-comment] Mapping Topics to Cyc: How To Handle Scope? | |
|---|---|---|
| From: | Murray Altheim (m.al...@open.ac.uk) | |
| Date: | Jul 12, 2002 6:26:21 am | |
| List: | org.oasis-open.lists.topicmaps-comment | |
Lars Marius Garshol wrote:
* Lars Marius Garshol | | BTW, here's a reference table to the terminology: | | +---------------------+--------------+-------+ | | Deprecated | Intersection | Union | | +---------------------+--------------+-------+ | | Sub-optimal | Or | And | | +---------------------+--------------+-------+ | | Currently preferred | Any | All | | +---------------------+--------------+-------+
This is wrong, of course. It should be:
+---------------------+--------------+-------+ | Deprecated | Intersection | Union | +---------------------+--------------+-------+ | Sub-optimal | And | Or | +---------------------+--------------+-------+ | Currently preferred | All | Any | +---------------------+--------------+-------+
So the second and third rows were wrong.
You guys had me confused, but I think I've discovered where my confusion originated. I agree with the corrected table, and I think the original error may have came about because we can look at this two ways, so perhaps an ambiguity of language has been the barrier.
There's (a) the union or intersection of the topics *as a scope*, then there's (b) the union or intersection of the *set of topics* bound by such a scope. We (or at least I) seem to have been confusing the two.
In the case of (a) I believe we're talking about the "semantic union" of the topics included in the scope, but in (b) we're talking about the logical (ie., set) intersection. But because "semantic union" is a bit on the intuitive side, the latter is perhaps the better definion. To borrow one of Jon Awbrey's Venn diagrams:
o-----------------------------------o | X | | o o | | / \ / \ | | / \ / \ | | / o \ | | / / \ \ | | / / \ \ | | / / \ \ | | / o P o \ | | / / \ \ | | o o o o | | \ \ / / | | \ Q \ / R / | | \ \ / / | | \ \ / / | | \ \ / / | | \ . / | | \ / \ / | | \ / \ / | | o o | | | o-----------------------------------o
Using a simplification of my earlier example, if Q is the set of topics considered as the scope of US Presidents and R is the set of topics whose temporal scope is "after 1977", then the intersection P is the set of topics including "Jimmy Carter".
I hope this finally clears things up (it did for me).
Murray
...................................................................... Murray Altheim <http://kmi.open.ac.uk/people/murray/> Knowledge Media Institute The Open University, Milton Keynes, Bucks, MK7 6AA, UK
If it wants to be a global power and a player in the Atlantic alliance, Europe has to get back into the business of making war. -- Newsweek Magazine, June 3, 2002