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[SKOS] On ISSUE-71 ParallelMappingVocabulary and ISSUE-74 MappingPropertyConventions [From Alistair Miles!]

From: Antoine Isaac <aisaac@few.vu.nl>
Date: Sun, 17 Feb 2008 23:27:39 +0100
Message-ID: <47B8B4DB.6020705@few.vu.nl>
To: SWD WG <public-swd-wg@w3.org>

Dear all,

I'm continuing to forward contributions from Alistair, in relation to 
[1] and to a mail that I will send next.
Antoine

[1] http://lists.w3.org/Archives/Public/public-swd-wg/2008Feb/0060.html

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[ISSUE-74] http://www.w3.org/2006/07/SWD/track/issues/74
 MappingPropertyConventions (RAISED)
 [ISSUE-71] http://www.w3.org/2006/07/SWD/track/issues/71
 ParallelMappingVocabulary (RAISED)
 
 Quick fix? No.
 
[ISSUE-74] asks, what are the usage conventions for SKOS mapping
properties and SKOS semantic relation properties? [ISSUE-71] asks, do we
need the properties skos:broadMatch, skos:narrowMatch and
skos:relatedMatch at all?
 
These two issues go right to the heart of recommended usage for SKOS
semantic relation and mapping properties. They are intimately related,
as usage conventions for mapping properties depend on vocabulary
available, and vice versa. I suggest we open these ASAP, to give time
for preparation and due consideration of alternatives.
 
To give a little background, the current SKOS Reference WD assumes that
the main reason for having a "parallel" vocabularies for
broader/narrower/related is to provide a convenient mechanism for
distinguishing links between concepts within the *same* scheme from
links between concepts in *different* schemes. This utility obviously
depends on certain usage conventions being followed, i.e. that
skos:broader, skos:narrower and skos:related are *only* used to link
concepts in the same scheme, and that skos:broadMatch, skos:narrowMatch
and skos:relatedMatch are *only* used to link concepts in different
schemes. To restate the point, if these usage conventions aren't
followed, then the main raison d'etre for skos:broadMatch,
skos:narrowMatch and skos:relatedMatch falls apart.
 
Note that [ISSUE-73] and [ISSUE-75] are both dependent on [ISSUE-71].
[ISSUE-73] asks, which other properties is skos:exactMatch disjoint
with? [ISSUE-75] asks, which other properties can be involved in
property chain inclusions with skos:exactMatch? Both of these questions
depend on the SKOS vocabulary recommended for mapping.
 
Note also that [ISSUE-83] is closely related to [ISSUE-71] and
[ISSUE-74], because the proposed inference pattern depends on usage
conventions which are not yet established. However, I suggest we
consider [ISSUE-83] separately as a lower priority, because the proposed
inference pattern can probably not be supported, regardless of our
decision on [ISSUE-74].

[ISSUE-73] http://www.w3.org/2006/07/SWD/track/issues/73
[ISSUE-75] http://www.w3.org/2006/07/SWD/track/issues/75
[ISSUE-83] http://www.w3.org/2006/07/SWD/track/issues/83
Received on Sunday, 17 February 2008 22:27:46 UTC

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