I was just scanning the specifications
from the Dublin Core Metadata Initiative (http://dublincore.org/).
They have an interesting proposed recommendation for "Expressing Qualified
Dublin Core in RDF / XML" here http://dublincore.org/documents/dcq-rdf-xml/index.shtml.
This might have some relevance.
-Rob
Lars Oppermann <>
09/13/2005 11:44 AM
To
cc
Subject
[office] Mapping OpenDocuemnt metadata
to RDF
Hi all,
During the last call, I started to talk a bit of how a mapping of our
meta data into RDF would look like.
These are the requirements of such a mapping, that I can currently think
of:
- must scale with extensions to meta.xml schema
- must work in both directions, so changes to the resulting RDF
model can be reflected in the meta.xml schema
- additional RDF statements in meta.xml must be able to reference
the statements made in meta.xml in order to make further statements
so currently in meta.xml, we make our statements like this:
<office:meta>
<dc:creator>John Smith</dc:creator>
<dc:date>2005-06-27T12:12:52</dc:date>
<meta:user-defined meta:name="Info 1">Hello World!</meta:user-defined>
</office:meta>
leaving out the user-defined fields for now, this could be easily
represented in RDF XML syntax like this:
<rdf:RDF>
<rdf:Description rdf:about="">
<dc:creator>John Smith</dc:creator>
<dc:date>2005-06-27T12:12:52</dc:date>
<meta:user-defined rdf:nodeID="_user_defined_1">
</rdf:Description>
<rdf:Description rdf:nodeID="_user_defined_1">
<meta:name>Info 1</meta:name>
<meta:value>Hello World!</meta:value>
</rdf:Description>
</rdf:RDF>
However, if additional statements were to be made, it is my current
understanding of RDF, that I could make them about any of the things,
that were defined as strings in the RDF i have given above.
A possible solution to this could be, to define a nodeID for every field
that we use in meta.xml, so instead of mapping to
<dc:creator>John Smith</dc:creator>
we would map to a blank node
<dc:creator rdf:nodeID="creator_node"/>
and make a statement about that node later
<rdf:Description nodeID="creator_node">
<dc:creator>John Smith</dc:creator>
</rdf:Description>
that way, anybody could make further statements about the creator.
I am not sure, whether the duplicate usage of the dc:creator predicate
is a sound way to do this, I am still quite new to all the semantic web
modeling approaches, so I'd be happy to receive your feedback on this.
Bests,
~Lars
--
Lars Oppermann <>
Sun Microsystems
Software Engineer - StarOffice
Sachsenfeld 4
Phone: +49 40 23646 959
D-20097 Hamburg
Fax: +49 40 23646 550
http://www.sun.com/staroffice
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