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Re: [SKOS] SKOS-XL & label relations

From: Antoine Isaac <aisaac@few.vu.nl>
Date: Tue, 15 Apr 2008 17:32:33 +0200
Message-ID: <4804CA91.7050703@few.vu.nl>
To: Alistair Miles <alistair.miles@zoo.ox.ac.uk>
CC: 'SWD WG' <public-swd-wg@w3.org>

Hi Alistair,

These are more detailed comments on your new XL proposal [1]

Section 3: identity of xl:Label. I think I miss the sentence that was in 
the previous draft [2] to explain that different instances of xl:Label 
can have a same literalForm
> Two different lexical label resources may share the same literal form. 
> In other words, if two lexical label resources share the same literal 
> form, they are not necessarily the same lexical label resource. The 
> data model has been defined in this way, to enable lexical label 
> resources to be part of concept schemes or other aggregations, and for 
> their membership in such aggregations to be part of their identity.

Section 3.4.2:
> @@TODO raise a SWD issue to consider relaxing domain of skos:inScheme?

+1, for making possible the story on XL literals as well as other useful 
situations (e.g. for SKOS extensions with newly defined entities are not 
skos:Concept but would require to be attached to a specific KOS)

Section 8:
I wonder whether seeRelation is too generic: seeLabelRelation, as was 
proposed before, is huglier, but less prone to misunderstandings...

Note that in the current version there will still be the problems about 
the use of seeRelation, as Tom pointed in [3].
I am especially sceptical about the refusal to create any integrity 
> This means that there does not necessarily have to be any 
> correspondence whatsoever between the SKOS lexical labels of a 
> resource, and the labels involved in an associated XL literal or label 
> relation. The example below, which is consistent with the SKOS+XL data 
> model, illustrates this.

Do you really think we cannot at least constrain one of the labels to 
belong to the concept to which the relation is linked? That does not 
appear very useful from an inference perspective but may make the story 
a bit easier to swallow...



[1] http://www.w3.org/2006/07/SWD/SKOS/xl/20080414
[2] http://www.w3.org/2006/07/SWD/wiki/SkosDesign/SKOS-XL
[3] http://lists.w3.org/Archives/Public/public-swd-wg/2008Mar/0083.html

> Hi all,
> Considering Antoine's comments at [1], it seems there are three alternate
> patterns for representing relations between lexical entities. Here, I call
> these three patterns "n-ary literal relations", "binary (XL) label
> relations" and "n-ary (XL) label relations". Currently, the SKOS Reference
> provides support for the first, my original "XL" sketch [2] supported the
> third, and nothing supported the second.
> Given the amount of implementation experience, it is difficult to make any
> judgments about which of these three patterns is "best". Most likely, each
> pattern will be suited to different situations, and there may be a need for
> all three. I had a chat with Sean about this this morning, and he felt the
> same way. 
> So I can see two options open to the WG.
> OPTION 1 - Move all support for relations between lexical entitites *out* of
> the SKOS Reference. (If time, publish a note illustrating three alternative
> patterns with some vocabulary.)
> OPTION 2 - Leave the current SKOS Reference features in place. (If time,
> publish a note illustrating the two remaining patterns with some
> vocabulary.)
> I had originally favoured option 2, however I am beginning to see that to
> favour any one pattern by placing it in the SKOS Reference does not
> accurately reflect the state of standardisation and consensus.
> If we chose option 1, we could then consider publishing a note on the three
> design patterns. For illustration, I've sketched the outline of such a note
> at:
> [3] <http://www.w3.org/2006/07/SWD/SKOS/xl/20080414>
> Best wishes,
> Alistair.
> [1] <http://lists.w3.org/Archives/Public/public-swd-wg/2008Apr/0041.html>
> [2] <http://www.w3.org/2006/07/SWD/wiki/SkosDesign/SKOS-XL>
> --
> Alistair Miles
> Senior Computing Officer
> Image Bioinformatics Research Group
> Department of Zoology
> The Tinbergen Building
> University of Oxford
> South Parks Road
> Oxford
> OX1 3PS
> United Kingdom
> Web: http://purl.org/net/aliman
> Email: alistair.miles@zoo.ox.ac.uk
> Tel: +44 (0)1865 281993
Received on Tuesday, 15 April 2008 15:33:05 UTC

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