DC comments & questions

[Tony Linde]

One other point I forgot: should we change ContentLevel to Audience, one of
the other DC terms?

Cheers,
Tony. 

> -----Original Message-----
> From: owner-registry at eso.org [mailto:owner-registry at eso.org] 
> On Behalf Of Tony Linde
> Sent: 05 October 2003 13:09
> To: registry at ivoa.net; Bob Hanisch; 'Roy Williams'
> Subject: DC comments & questions
> 
> 
> Hi Bob, Roy et al,
> 
> I checked out PDS profiling yesterday and their use of DC. It 
> is similar to ours but they're using their own element 
> descriptive language (keyword=value
> based) where we're using xml schema. PDS cannot therefore use 
> inheritance and other features of xml schema that we're 
> making use of. 
> 
> PDS have implemented a sort of registry browser with 
> cross-links between missions, datasets, hosts, instruments 
> etc and with links from keywords to help text and 
> enumerations. A really good utility that we'd do well to emulate.
> 
> The PDS seem to only have ued Identifier, Title and Format 
> from DC. It also seems a fairly recent adoption as many of 
> the actual products I found did not have these as part of the 
> metadata but I might have been looking at the wrong things.
> 
> I also looked into DC closer today and have a few questions:
> 
> 1. I see in the schemas that DC-related elements are 
> annotated with <vm:dcterm> elements - how are these to be 
> used? And ought we to be namespacing to DC instead?
> 
> 2. Where, with things like identifier and coverage, we have 
> structured data while DC mandates simple string data, how and 
> where does this conversion take place?
> 
> 3. Should we, like PDS, block all our DC terms into a single 
> complex type? 
> 
> 4. If so and where our metadata does not map to a simple 
> string, should we put the DC term in here and mandate that it 
> is not captured from the user/dataaset but is constructed 
> from the structured metadata in some way (as we've defined 
> the way of turning an Identifier into a URI)?
> 
> 5. Finally, how do we use DC? When metadata from our 
> registries is harvested to non-astro sites, what do they 
> take: only the DC terms or all of the metadata? And how is 
> OAI related to DC?
> 
> Cheers,
> Tony. 
> __
> Tony Linde                       Phone:  +44 (0)116 223 1292
> AstroGrid Project Manager        Fax:    +44 (0)116 252 3311
> Dept of Physics & Astronomy      Mobile: +44 (0)7753 603356
> University of Leicester          Email:  ael at star.le.ac.uk
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> 
>