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Re: Top three levels of Dewey Decimal Classification published as linked data

From: Ed Summers <ehs@pobox.com>
Date: Wed, 19 Aug 2009 20:10:49 -0400
Message-ID: <f032cc060908191710n7e59153wc8d129442838a5dc@mail.gmail.com>
To: "Panzer,Michael" <panzerm@oclc.org>
Cc: public-lod@w3.org
Hi Michael,

This is really exciting news, especially for those of us Linked Data
enthusiasts in the world of libraries and archives. Congratulations!

I haven't fully read the wiki page yet, so I apologize if this
question is already answered there. I was wondering why you chose to
mint multiple URIs for the same concept in different languages. For
example:

uqbar:~ ed$ rapper -o turtle http://dewey.info/class/641/

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xhtml: <http://www.w3.org/1999/xhtml/vocab#> .
@prefix cc: <http://creativecommons.org/ns#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<http://dewey.info/class/641/2009/08/about.en>
    cc:attributionName "OCLC Online Computer Library Center, Inc." ;
    cc:attributionURL <http://www.oclc.org/dewey/> ;
    cc:morePermissions <http://www.oclc.org/dewey/about/licensing/> ;
    dct:isVersionOf <http://dewey.info/class/641/> ;
    dct:language "en"^^dct:RFC4646 ;
    a skos:Concept ;
    xhtml:license <http://creativecommons.org/licenses/by-nc-nd/3.0/> ;
    skos:broader <http://dewey.info/class/64/2009/08/about.en> ;
    skos:inScheme <http://dewey.info/scheme/2009/08/about.en> ;
    skos:notation "641"^^<http://dewey.info/schema-terms/Notation> ;

<http://dewey.info/class/641/2003/08/about.de>
    cc:attributionName "OCLC Online Computer Library Center, Inc." ;
    cc:attributionURL <http://www.oclc.org/dewey/> ;
    cc:morePermissions <http://www.oclc.org/dewey/about/licensing/> ;
    dct:isVersionOf <http://dewey.info/class/641/> ;
    dct:language "de"^^dct:RFC4646 ;
    a skos:Concept ;
    xhtml:license <http://creativecommons.org/licenses/by-nc-nd/3.0/> ;
    skos:broader <http://dewey.info/class/64/2003/08/about.de> ;
    skos:inScheme <http://dewey.info/scheme/2003/08/about.de> ;
    skos:notation "641"^^<http://dewey.info/schema-terms/Notation> ;
    skos:prefLabel "Essen und Trinken"@de .

...

I kind of expected the assertions to hang off of a language and
version agnostic URI, with perhaps dct:hasVersion links to previous
versions.

<http://dewey.info/class/641/>
    cc:attributionName "OCLC Online Computer Library Center, Inc." ;
    cc:attributionURL <http://www.oclc.org/dewey/> ;
    cc:morePermissions <http://www.oclc.org/dewey/about/licensing/> ;
    dct:hasVersion <http://dewey.info/class/641/2009/08/> ;
    dct:language "de"^^dct:RFC4646 ;
    a skos:Concept ;
    xhtml:license <http://creativecommons.org/licenses/by-nc-nd/3.0/> ;
    skos:broader <http://dewey.info/class/64/2003/08/about.de> ;
    skos:inScheme <http://dewey.info/scheme/2003/08/about.de> ;
    skos:notation "641"^^<http://dewey.info/schema-terms/Notation> ;
    skos:prefLabel "Food & drink"@en, "Essen und Trinken"@de .

See how multiple skos:prefLabel assertions can be made using the same
subject? To illustrate why I think this is important consider how
someone may use the resources at dewey.info:

    <http://openlibrary.org/b/OL11604988M> dct:subject
<http://dewey.info/class/641/> .

If we follow our nose to http://dewey.info/class/641 we will get back
some RDF, but the description we get isn't about the subject
<http://dewey.info/class/641/> so what are we to make of the above
assertion?

Another unrelated thing I noticed is that the RDFa doesn't seem to be
usable by the RDFa Distiller:

    http://tinyurl.com/nm8lfa

Sorry if this was too long. Let me just say again how exciting it is
to see this work coming out of OCLC.

//Ed
Received on Thursday, 20 August 2009 00:11:30 UTC

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