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DC-REGISTRY  August 2002

DC-REGISTRY August 2002

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Subject:

Re: Registry Update

From:

"Wagner,Harry" <[log in to unmask]>

Reply-To:

A mailing list for the group discussing registration of qualifiers to the D <[log in to unmask]>

Date:

Mon, 12 Aug 2002 22:37:05 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (82 lines)

Seth,
Creating new semantics is outside the scope of this WG.  You may want to
send this to the architecture WG?  The goal of the registry (published at
http://dublincore.org/groups/registry/) is "providing authoritative
information regarding the DCMI vocabulary and the relationship between terms
in that vocabulary".

There are 3 registered schemas currently in the registry:

http://purl.org/dc/elements/1.1/
http://purl.org/dc/terms/
http://purl.org/dc/dcmitype/

They are listed on the search page under the large heading "Summary of
Registered RDF Schemas".  They are displayed when you first access the page,
or by selecting "display schemas" from the drop-down list.  Click on the
links to view detail information.  Click again to view the schema source.
As I mentioned in my reply to Pete, there are slight differences between
these schemas and what is loaded in the registry.

I am confused by your seeAlso comment.  We use 'isDefinedBy' to relate
properties and classes to a particular schema.  seeAlso is used for
secondary references to documentation.

Regards,
Harry

-----Original Message-----
From: Seth Russell [mailto:[log in to unmask]]
Sent: Monday, August 12, 2002 5:53 PM
To: [log in to unmask]
Subject: Re: Registry Update


From: "Pete Johnston" <[log in to unmask]>
>
> But I don't think that is the RDF schema which has been indexed by the
> registry e.g. it doesn't include the recently added date refinements but
> descriptions of those properties _are_ visible in the HTML displays
> generated by the registry. (I think that was Seth's original question?)

Yes, you put it better though ... also see below.

> Should the registry display hyperlinks to URL(s) of schema(s) indexed
> rather than just namespace name/URI? (or is that even more confusing?!)

Yes, please!  Not only that, but the registry, imho, should publish a RDF
file describing all schemas and display a link to that RDF file promonantly.
It's strange that the registry has not defined a unambiguous property that
would only take RDF and N3 documents as objects, such a property really does
belong in the DC space.  May I suggest the following:

dc:semref
    type Property;
    subPropertyOf seeAlso;
    domain Resource;
    range Resource;
    rdfs:comment "Relates any resource to a schema document. Note that this
property
       is distinguished from seeAlso by requireing the object resource to be
a RDF or N3 file.
      Also note that this property is to RDF documents as <a href> is to
HTML documents."

Including this term in your vocabulary is essential to writing metadata that
describes your own schema documents, and unambiguously tells an automated
agent where to retrieve them.  'seeAlso' has frequently been used for this
purpose but the automated agent doesn't know whether the object is a html
file or a RDF file without dereferencing.  Here (to my knowledge) is a
metadata description of your schema files  ... I only hope I got them all,
with their correct URI, and the latest versions ... but I have no idea from
reading your pages :(

(doublin core schema documents)
    dc:semref
        <http://purl.org/dc/elements/1.1/>,
        <http://purl.org/dc/dcmitype/> ,
        <http://dublincore.org/2000/03/13/eor>.

Seth Russell
http://robustai.net/sailor/

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