[OAI-implementers] Sets and multiple formats

Naomi Dushay Naomi at cs.cornell.edu
Thu Mar 9 16:25:25 EST 2006

Given that you must specify the metadata format for all harvesting, included
selective harvesting, it makes sense to have your sets group items without
regard to format.

That is:


When a harvester makes a request:


However, since you use "annotations" as your example second format, the
question may be whether your "annotations_for_oai_dc" is truly another
metadata format (a different view of the same item, to use OAI-PMH parlance),
or whether it's different content.

Also, records can belong to multiple sets:


- Naomi

> -----Original Message-----
> From: oai-implementers-bounces at openarchives.org 
> [mailto:oai-implementers-bounces at openarchives.org] On Behalf 
> Of John Weatherley
> Sent: Thursday, March 09, 2006 4:14 PM
> To: oai-implementers at openarchives.org
> Subject: [OAI-implementers] Sets and multiple formats
> We are reconsidering the way we define sets and the following 
> question 
> has come up: Does it make sense to define a set that includes records 
> from two fundamentally different metadata formats or is it better to 
> stick to one format per set?
> For example, suppose a repository contains the following metadata 
> formats:
> metadataPrefix=oai_dc
> metadataPrefix=annotations_for_oai_dc
> Is it better to have a single set that includes records from both of 
> the above, such as:
> setSpec=records_and_annotations_about_oceans
> or better to split the sets by format:
> setSpec=records_about_oceans
> setSpec=annotations_about_oceans
> Or is either approach equally OK?
> I'm curious what others have done in this regard and whether 
> there are 
> any conventions that have taken shape?
> Thanks,
>   -john
> PS:
> The OAI protocol defines sets in the following way:
> "The actual meaning of a set or of the arrangement of sets in 
> a repository is not defined in the protocol. It is expected 
> that individual communities may formulate well-defined set 
> configurations with perhaps a controlled vocabulary for 
> setNames and setSpec , and may even develop mechanisms for 
> exposing these to harvesters. For example, a group of 
> cooperating e-print archives in a specific discipline may 
> agree on sets that arrange metadata in their repositories 
> based on a controlled subject classification."
> I do not see any discussion in the documentation about the 
> singularity or multiplicity of metadata formats in respect to sets.
> John Weatherley
> DLESE Program Center
> University Corporation for Atmospheric Research (UCAR)
> PO Box 3000
> Boulder, CO 80307-3000
> jweather at ucar.edu (e-mail)
> (303) 497-2680 (tel)
> (303) 497-8336 (fax)

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