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ZNG  August 2005

ZNG August 2005

Subject:

Re: Multiple Schemas per Request summary

From:

"Matthew J. Dovey" <[log in to unmask]>

Reply-To:

Z39.50 Next-Generation Initiative

Date:

Fri, 12 Aug 2005 11:37:57 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (31 lines)

> If the intention is to include properties describing the 
> metadata record
> (REC), then perhaps it might be better for SRW/SRU to adopt 
> the approach
> taken by OAI PMH and place this information in a record "header"
> separate from the metadata.

This doesn't necessarily work in all cases - I think I did give the
learning object repository example where we potentially might return a
learning object, learning object metadata and learning object metadata
metadata (e.g. a REC record for the metadata). At present we *are* just
using different transactions (requesting different recordSchema)
depending on which we want back, and don't (yet) have a real requirement
to get all back in a single response.
 
> This would be a useful place to park other types of data we haven't
> considered yet, for example Rights Data applying to the 
> metadata record.

The issue is we could add such a header - but in many ways we are
duplicating what other (and possible better) schemas such as METS,
MPEG21 etc. already do.

Also adding the header does not necessarily address the other
requirement - which is someone who *is* using a container schema such as
METS may wish to be able to request what schemas are contained within
that container (admittedly it isn't yet clear whether this is a real
requirement now or just anticipation of a future one).

Matthew

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