After watching Kevin Ford's SWIB12 presentation recording and slides I have some questions about the 
nature of the Work class.

Kevin talks about the conversion process, conversion tools, splitting of 
MARC records, etc. And there is an example of a BIBFRAME RDF 
representation of a resulting Work.

Looking at the described conversion procedures and the RDF example 
somehow I get the feeling that BIBFRAME Works will be treated as local 
redundant entities. I hope I'm wrong. Of course the BIBFRAME model can 
be implemented in a number of ways, both as local silo and as globally 
shared data. But I had the impression that 'based on linked data' meant 
abolition of redundancy by linking instead of copying/duplicating, not 
just using RDF as storage format.

Ideally, a Work would be described only once, and as such be similar to 
an authority record to which links are made from Instances and 
Annotations. Of course in the real world we will have a limited number 
of redundant Work data stores. For this we would use "sameAs" relationships.

In Kevin's RDF example I see however four Instance URIs, which would 
only make sense if this is a local library 'record' containing links to 
all local holdings of the work (FRBR Manifestations, originating from 
local legacy MARC records).
A globally shared Work entity would of course never be able to hold 
links to all Instances existing in the world. This would not make any 
sense at all. A Work would not contain any Instance links at all. 
Rather, all Instances of a specific Work would obviously have one link 
to that Work.
The only use for links to Instances in a Work would be to indicate 
provenance, which already is taken care of by the 'derivedFrom' and 
'consolidates' links in the example.

Anyway, I would expect libraries only to be dealing with Annotations for 
their own local holdings, linking, in their own new linked data ready 
systems, to existing Instances (FRBR Manifestations) made available by 
authorities such as LoC, OCLC, publishers, etc.
Of course, Works and Instances might be available for editing by other 
trusted parties in a wikipedia way.

Lukas Koster
Library Systems Coordinator
Library and Information Systems Department
Library of the University of Amsterdam
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