Dear all,
There has been discussion about the relative merits of
modelling the term declarations for encoding schemes in RDF
using rdfs:Class as opposed to rdfs:Datatype.
In particular, this was discussed at a breakout session in
Florence last 15 October.
In the interest of documenting that discussion in a citable
form, I summarize my notes on this point below.
Tom
--------------------------------------------------------------
2002-06-04: in
http://www.mathematik.uni-osnabrueck.de/projects/dcqual/qual21.3.1/Schema/A/dcterms,
Roland declares the Encoding Scheme http://purl.org/dc/terms/W3CDTF
as follows
--------------------------------------------------------------
<rdfs:Class rdf:about="&dctermsns;DateScheme">
<rdfs:label xml:lang="en-US">Date Encoding Schemes</rdfs:label>
<rdfs:comment xml:lang="en-US">A set of date encoding schemes
and/or formats </rdfs:comment>
<dcterms:references rdf:resource="&dcns;date"/>
<dcterms:references rdf:resource="&dctermsns;temporal"/>
<rdfs:isDefinedBy rdf:resource="&dctermsns;"/>
<dcterms:issued>2000-07-11</dcterms:issued>
</rdfs:Class>
<dcterms:DateScheme rdf:about="&dctermsns;W3CDTF">
<rdfs:label xml:lang="en-US">W3C-DTF</rdfs:label>
<rdfs:comment xml:lang="en-US">W3C Encoding rules...</rdfs:comment>
<rdf:type rdf:resource="&rdfsns;Class"/>
<rdf:type rdf:resource="&dctermsns;TemporalScheme"/>
<rdfs:seeAlso rdf:resource="http://www.w3.org/TR/NOTE-datetime"/>
<rdfs:isDefinedBy rdf:resource="&dctermsns;"/>
<dcterms:issued>2000-07-11</dcterms:issued>
</dcterms:DateScheme>
---------------------------------------------------------------
2002-10-15: in a breakout session in Florence, members of the
DCMI Architecture Working Group and the SWAD Europe project
collectively modified the declaration above to read as follows:
---------------------------------------------------------------
<rdfs:Datatype rdf:about="&dcenc;DateScheme">
^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^
<rdfs:label xml:lang="en-US">Date Encoding Schemes</rdfs:label>
<rdfs:comment xml:lang="en-US">A set of date encoding schemes
and/or formats </rdfs:comment>
<dcusage:qualifies rdf:resource="&dcns;date"/>
^^^^^^^^^^^^^^^^^^
<dcusage:qualifies rdf:resource="&dctermsns;temporal"/>
^^^^^^^^^^^^^^^^^^
<rdfs:isDefinedBy rdf:resource="&dctermsns;"/>
<dcterms:issued>2000-07-11</dcterms:issued>
</rdfs:Datatype>
<dcenc:DateScheme rdf:about="&dctermsns;W3CDTF">
^^^^^^^^^^^^^^^^^
<rdfs:label xml:lang="en-US">W3C-DTF</rdfs:label>
<rdfs:comment xml:lang="en-US">W3C Encoding rules...</rdfs:comment>
<rdf:type rdf:resource="&rdfsns;Class"/>
<rdf:type rdf:resource="&dcenc;TemporalScheme"/>
^^^^^^^
<dcusage:see rdf:resource="http://www.w3.org/TR/NOTE-datetime"/>
^^^^^^^^^^^^
<rdfs:isDefinedBy rdf:resource="&dctermsns;"/>
<dcterms:issued>2000-07-11</dcterms:issued>
</dcenc:DateScheme>
--------------------------------------------------------------
2002-10-21: Eric followed up with an RDF schema
declaring W3CDTF in yet another way (see
http://www.w3.org/2002/09/19-usage/v2/dcenc.rdf):
--------------------------------------------------------------
<rdfs:Datatype rdf:about="http://purl.org/dc/terms/W3CDTF">
<rdf:type
rdf:resource="http://dublincore.org/usage/documents/principles/#encoding-scheme" />
<rdfs:label>W3C-DTF</rdfs:label>
<rdfs:comment>W3C Encoding rules for dates and times - a profile
based on ISO 8601</rdfs:comment>
<dcu:qualifies rdf:resource="http://purl.org/dc/elements/1.1/date" />
<dcu:qualifies rdf:resource="http://purl.org/dc/terms/temporal" />
<dcu:see rdf:resource="http://www.w3.org/TR/NOTE-datetime" />
</rdfs:Datatype>
--
Dr. Thomas Baker [log in to unmask]
Institutszentrum Schloss Birlinghoven mobile +49-160-9664-2129
Fraunhofer-Gesellschaft work +49-30-8109-9027
53754 Sankt Augustin, Germany fax +49-2241-144-2352
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