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DCMI Metadata Terms - request for help with RDF schemas

From: Thomas Baker <tom@tombaker.org>
Date: Mon, 21 May 2012 18:05:08 -0400
To: public-rdfa <public-rdfa@w3.org>
Message-ID: <20120521220507.GA36428@alpha.dublincore.org>
Gregg, all,

Jon and I are working hard to get DCMI Metadata Terms published ASAP.  We are
currently focusing on content negotiation.  We plan to redirect all PURLs to a
directory such as http://dublincore.org/2012-05-21.  Jon has written an
.htaccess file for that directory that would direct incoming requests for the
four "namespace" schemas -- Turtle by default, RDF/XML by request -- and
requests for HTML to /documents/dcmi-terms/.  Jon is working on some
Javascript, to be embedded in http://dublincore.org/documents/dcmi-terms/,
which would take the browser to the spot in the document where the requested
term is described.

This will take some additional testing before it goes live, but we're
optimistic.

In the meantime, we would appreciate some help in fixing three little problems
in the scripts that generate the RDF schemas [1]:

-- One triple, not yet supported by the scripts, is missing:
   <http://purl.org/dc/terms/creator> owl:equivalentProperty <http://xmlns.com/foaf/0.1/maker>

   The source that would need to be supported is at [2], the script that 
   needs fixing is (I think!) at [3].

-- Dates are not fully qualified with datatypes (as they are in the RDFa/HTML document.
   For example, the schemas say:

       <http://purl.org/dc/terms/valid> dcterms:issued "2000-07-11" .

   instead of 

       <http://purl.org/dc/terms/valid> dcterms:issued "2000-07-11"^^<http://www.w3.org/2001/XMLSchema#date> .

-- Two of the RDF schemas generated from the scripts express redundant triples (see
   below).  This problem appears to have two aspects:

   1) The script is apparently outputting malformed XML (look closely at line 16 in 
      dcam.rdf) [8] but neither Jon nor I know XSL well enough to see why.

   2) In both dcelements.rdf and dcam.rdf, the RDF/XML says:

        <rdf:Property rdf:about="http://purl.org/dc/elements/1.1/creator">
        <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Property"/>

      whereas in dctype.rdf and dcterms.rdf, the RDF/XML says:

        <rdf:Description rdf:about="http://purl.org/dc/terms/creator">
        <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Property"/>

      This would account for the "redundant triples", but neither Jon nor I can see how
      the scripts are leading to these different results.

We would much appreciate help in this.

Many thanks,
Tom

[1] https://github.com/dublincore/website/tree/master/build
[2] https://github.com/dublincore/website/blob/master/2012-05-21/xmldata/dcterms-properties.xml#L64
[3] https://github.com/dublincore/website/blob/master/web/xsl/dcelements.xsl
[4] https://github.com/dublincore/website/blob/master/build/dcelements.rdf
[5] https://github.com/dublincore/website/blob/master/build/dcam.rdf
[6] https://github.com/dublincore/website/blob/master/build/dcelements.rdf
[7] http://rdf.greggkellogg.net/distiller?format=ntriples&in_fmt=rdfxml&uri=https://raw.github.com/dublincore/website/master/build/dcelements.rdf
[8] https://github.com/dublincore/website/blob/master/build/dcam.rdf#L16


----------------------------------------------------------------------
Redundant triples generated from [4]

    <http://purl.org/dc/dcam/VocabularyEncodingScheme>  rdf:type rdfs:Class .
    <http://purl.org/dc/dcam/memberOf>                  rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/contributor>       rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/coverage>          rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/creator>           rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/date>              rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/description>       rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/format>            rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/identifier>        rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/language>          rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/publisher>         rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/relation>          rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/rights>            rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/source>            rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/subject>           rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/title>             rdf:type rdf:Property .
    <http://purl.org/dc/elements/1.1/type>              rdf:type rdf:Property .


-- 
Tom Baker <tom@tombaker.org>
Received on Monday, 21 May 2012 22:06:04 GMT

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