Provide guidance on the use of the occurranceID and dcterms:references terms.

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The iDigBio request for comments on a GUID policy 
https://www.idigbio.org/content/globally-unique-identifiers-guid  raises the 
issue of what the GUIDs in various TDWG DarwinCore terms are intended to 
reference.  We should provide guidance on the use of the occurranceID and 
dcterms:references terms.  

We should probably amplify the DarwinCore statement about occurranceID being an 
identifier of the underlying thing (and clarify if we expect this to be a 
herbarium sheet or a duplicate set) rather than it's digital representation.

I'll suggest we should support and amplify the DarwinCore suggestion of using 
the scheme urn:catalog:[institutionCode]:[collectionCode]:[catalogNumber] for 
occurranceID when a GUID is not available.

We could also suggest use of dcterms:references as a pointer to a canonical 
digital representation of the occurrance.  This appears to be what is done in 
the DarwinCore examples of 
references=http://mvzarctos.berkeley.edu/guid/MVZ:Mamm:165861  and 
occurranceID=urn:catalog:FMNH:Mammal:145732

Original issue reported on code.google.com by mole@morris.net on 2 Feb 2012 at 8:11

[GoogleCodeExporter]

Just discussing occurranceID and botanical duplicates with Bob Morris.  The 
definition of occurranceID clearly points to the Occurrance from which the 
duplicates are all derived, so all herbarium sheets that are members of the 
same duplicate set should end up with the same occurranceID.  We should, 
however, be able to get away with starting by issuing distinct GUIDs for the 
occurranceID for each herbarium sheet, then asserting which herbarium sheets 
are members of the same duplicate set, then carrying out an action like issuing 
owl:sameAs on these occurranceIDs.  

Original comment by mole@morris.net on 2 Feb 2012 at 8:53