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Re: Using SKOS for representing Drupal taxonomy vocabularies and terms

From: Stephane Corlosquet <scorlosquet@gmail.com>
Date: Sun, 21 Mar 2010 16:30:42 -0400
Message-ID: <1452bf811003211330j4ce441dsad210fde46e02e01@mail.gmail.com>
To: Antoine Isaac <aisaac@few.vu.nl>
Cc: public-esw-thes@w3.org, semantic-web@w3.org
Thanks Antoine for these thumbs up!

In the same spirit, you might see that we hinted at using Dublin Core's
> dcterms:subject for using concepts as subject of documents (i.e., the link
> between "node" and "term" at [1]). But as sioc:topic is a subproperty of
> dcterms:subject, everything is perfect.
>

In fact, we recently fixed that to use dc(terms):subject instead of
sioc:topic, I just haven't taken the time to incorporate this change in the
graph, but I will update it at the same time as the SKOS changes.


And don't hesitate to post other questions here, if you have any.
>

There you go: S14 [6] says "A resource has no more than one value of
skos:prefLabel per language tag." (though it's not formally expressed in the
RDF schema [7]). How is that supposed to work if one wanted to map
(owl:sameAs) a Drupal term (skos:Concept) to another Concept from elsewhere
like dbpedia or another authoritative thesaurus which has a different
skos:prefLabel? Is that an argument in favor of maybe dropping
skos:prefLabel and use something more generic like rdfs:label? How do people
feel about using dc:title for the label of a skos:Concept? Or is there a
better property for mapping the two which would not have the same effects as
owl:sameAs? (cc'ing semantic-web@w3.org for these more generic questions).


Steph.

[6] http://www.w3.org/TR/skos-reference/#L1567
[7] http://www.w3.org/2009/08/skos-reference/skos.rdf

On Sun, Mar 21, 2010 at 12:45 PM, Antoine Isaac <aisaac@few.vu.nl> wrote:

> Dear Stephane,
>
> The proposed change (i.e., using skos:ConceptScheme and skos:inScheme
> instead of skos:Collection and skos:member) is certainly the way to go!
>  SKOS collections are rather for groupings of concepts *within* a
> vocabulary.
>
> About the rest: you might hear sometime that "terms" are not in a perfect
> match with SKOS' "concepts". But from what I understand from your use case
> [3], your mapping seems perfectly valid. In fact the case is very close to
> some of the use cases SKOS has had [4].
>
> Also, there has been some use of Dublin Core properties to described SKOS
> concept schemes [5], maybe you want to re-use them for your "vocabulary"
> node at [1]. You can also use some SKOS documentation properties there as
> well, such as skos:definition or skos:scopeNote. But feel free to follow
> your own intuition, as we never came close to any formal recommendation on
> that matter.
>
> In the same spirit, you might see that we hinted at using Dublin Core's
> dcterms:subject for using concepts as subject of documents (i.e., the link
> between "node" and "term" at [1]). But as sioc:topic is a subproperty of
> dcterms:subject, everything is perfect.
>
> By the way, I guess everyone on this SKOS mailing list is glad to see SKOS
> uptake in the Drupal community. Keep up the excellent work! And don't
> hesitate to post other questions here, if you have any.
>
> Cheers,
> Antoine
>
>
> [1]
> http://openspring.net/blog/2010/01/12/rdfa-in-drupal-7-last-call-for-feedback-before-alpha-release
> [2] http://groups.drupal.org/node/44094#comment-154828
> [3] http://drupal.org/handbook/modules/taxonomy
> [4] http://www.w3.org/TR/skos-ucr
> [5] http://www.w3.org/TR/skos-primer/#secscheme
>
>
>
>  Hi,
>>
>> As you might already know, Drupal 7 will expose its data as RDFa and
>> we've tried to represent Drupal's internal structure in RDF. The current
>> status of the schema is depicted in the graph at [1]. We received a
>> comment at [2] recommending to use skos:ConceptScheme instead of
>> skos:Collection for vocabularies. This seems a fair point, and I would
>> like to get some feedback from the SKOS community before I make this
>> change, as there might other things we've missed. The main concepts we
>> have in Drupal are taxonomy vocabularies and terms. Each term belong to
>> one vocabulary. So far we've mapped 'term' to skos:Concept, and I think
>> that's fine. We've mapped 'vocabulary' to skos:Collection but the
>> suggested change is to use skos:ConceptScheme instead, which would also
>> imply to use skos:inScheme between each term and the vocabulary it
>> belongs to. Below are some examples using a vocabulary for 'countries'
>> and a term for 'Italy'.
>>
>> With the current RDF representation:
>>
>> site:vocabularyCountries a skos:Collection .
>>     skos:member site:termItaly.
>> site:termItaly a skos:Concept .
>>
>>
>> With the proposed change:
>>
>> site:vocabularyCountries a skos:ConceptScheme .
>> site:termItaly a skos:Concept ;
>>     skos:inScheme site:vocabularyCountries .
>>
>>
>> And with all the other metadata for vocabulary and term:
>>
>> site:vocabularyCountries a skos:ConceptScheme ;
>>     rdfs:label "Countries" ;
>>     rdfs:comment "A vocabulary containing countries on a Drupal site" .
>> site:termItaly a skos:Concept ;
>>     skos:prefLabel "Italy" ;
>>     skos:definition "A term for Italy in a Drupal site" ;
>>     skos:inScheme site:vocabularyCountries .
>>
>>
>> I would appreciate any feedback on whether this is the best way of using
>> SKOS in the context of Drupal taxonomies [3].
>>
>> all the best,
>> Steph.
>>
>> [1]
>>
>> http://openspring.net/blog/2010/01/12/rdfa-in-drupal-7-last-call-for-feedback-before-alpha-release
>> [2] http://groups.drupal.org/node/44094#comment-154828
>> [3] http://drupal.org/handbook/modules/taxonomy
>>
>
>
Received on Sunday, 21 March 2010 20:31:16 UTC

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