Re: [Digir-dev] Question on DiGIR Darwin Core and uniqueness of Catalog Numbers

[Dave V. <vie...@KU...>]

Hi Donald,
The combination of institution code, collection code and catalog numb=
er=20
should provide a unique identifier for specimens.

regards,
   Dave V.

Donald Hobern wrote:

>=20
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> I=92d like to find out how different projects have viewed CatalogNu=
mbers.=20
>  I had assumed that CatalogNumbers should be unique within any DiGI=
R=20
> resource and hence that the CatalogNumber should serve as a unique =
key=20
> to retrieve the record again from that resource.
>=20
> =20
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> I have just found a provider which is reusing the same CatalogNumbe=
r for=20
> different records but with a different CollectionCode for each.  Lo=
oking=20
> at the DwC documentation this seems valid.  Indeed it would seem to=
 be=20
> valid to have records sharing the same CollectionCode and CatalogNu=
mber=20
> provided that they have different InstitutionCode values.  Should=
=20
> clients of DiGIR resources always provide all three of these concep=
ts=20
> when they issue a search request for a given record?  Or is there a=
n=20
> unwritten assumption that CatalogNumbers should be unique on their =
own?
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> =20
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> Many thanks for your thoughts,
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> =20
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> Donald
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> =20
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> ---------------------------------------------------------------
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> Donald Hobern (dh...@gb...)
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> Programme Officer for Data Access and Database Interoperability
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> Global Biodiversity Information Facility Secretariat
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> Universitetsparken 15, DK-2100 Copenhagen, Denmark
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> Tel: +45-35321483   Mobile: +45-28751483   Fax: +45-35321480
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> ---------------------------------------------------------------
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> =20
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