As a consumer of specimen GUIDs, I've found specimens to be frustrating to deal with as individual collections don't guarantee uniqueness of identifiers (Donald's point 2 below). For example, in the absence of specimen GUIDs (such as LSIDs) I'd hoped to use a three part identifier based on the DiGIR provider, e.g.

DiGIR provider URL : resource : specimen code

Hence,

digir.fieldmuseum.org/digir/DiGIR.php:MammalsDwC2:FMNH158106 -----------------------------------/ ---------/ --------/ provider resource specimen

identifies specimen FMNH 158106 of Tatera robusta at the Field Museum in Chicago. The idea behind this crude hack is that the identifier can be resolved (there's enough information in the identifier to retrieve the record, see for example http://darwin.zoology.gla.ac.uk/~rpage/hacks/2/index.html ).

To my horror, if I do this for MVZ 148946, I get three specimens back, one each for Chaetodipus baileyi baileyi, Calidris mauri, and Rana cascadae. This is an instance where the same specimen code is being used in three different collections (mammals, birds, and herps). I guess MVZ could have avoided this by using a different name for the 'resource' field for each collection.

I offer this as an example of where GUIDs are vital if we are to avoid linking to the wrong information, and also where individual providers need to ensure that the identifiers they generate are unique.

Regards

Rod

Professor Roderic D. M. Page Editor, Systematic Biology DEEB, IBLS Graham Kerr Building University of Glasgow Glasgow G12 8QP United Kingdom

Phone: +44 141 330 4778 Fax: +44 141 330 2792 email: r.page@bio.gla.ac.uk web: http://taxonomy.zoology.gla.ac.uk/rod/rod.html reprints: http://taxonomy.zoology.gla.ac.uk/rod/pubs.html

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