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Am 25.08.2015 um 19:58 schrieb Karen Coyle:

>> bf:contributor [
>>    a bf:Contributor ;
>>    bf:role<http://id.loc.gov/vocabulary/relators/ill>  ;
>>    bf:role<http://id.loc.gov/vocabulary/relators/aut>  ;
>>    bf:agent<http://id.loc.gov/authorities/names/1234>  ;
>>    bf:agent<http://d-nb.info/gnd/9876>  ].
>>
>> (MARC semantics: two different roles for one bibliographic
>> identity accounted for in different authority files)
> 
> Wouldn't it be preferable that any equivalence between agent identifie
rs
> be declared outside of the instance data for a bibliographic resource?
> Logically, the information that they are equivalent is not related to 
a
> particular bibliographic resource, but is a fact related to the agents
> themselves. It should hold true for all instances.

Well, I wouldn't expect that one cataloging agency would tie its
activities to more than one authority control environment. And if,
it probably would encapsulate that into some local construction
detailing on the exact findings of the agency:

bf:contributor [
   a bf:Contributor ;
   bf:agent<http://example.com/authorities/xyz> ]

<http://example.com/authorities/xyz> [
  a schema:Person ;
  a bf:Agent ;
  rdfs:label "John Doe (1900-1983)" ;
  skos:exactMatch <http://id.loc.gov/authorities/names/1234> ;
  schema:sameAs <http://d-nb.info/gnd/9876> ;
  owl:differentFrom <http://www.wikidata.org/entity/abc>
 ].

But for some bibliographic aggregator who does not want to presuppose
the authority control ecosystem potential consumers of its data would
prefer I can imagine descriptions where alternative(!) identifications
for the bf:contributor are supplied. I mean, there certainly must have
been a use case when MARC's 7XX $0 was introduced as repeatable?

I'd consider this "instancial" evidence of possible identity, declaring
equivalence in the context of a bf:Agent would be a stronger statement.

BTW: Different authority control systems use rather different
vocabularies to establish cross border identification of their
resources (there seems to be a general tendency to avoid owl:sameAs,
though). Given the fact that even for simple agents like persons
the entities not always are in 1:1 correspondance (e.g. LCAuth focussing
on bibliographic identities, and ULAN very much on real persons),
could or should there be a bf:identicalTo property declaring equivalence
in a Bibframe sense? Or would identity rather be something to be
defined by the application, e.g. data created in the context of a
manuscript and letters application would probably not distinguish
between Ruth Rendell and Barbara Vine and thus would use "regular"
authority control with a deviant notion of equivalence ;)


> (This brings up the question of usage of VIAF identifiers in the place
> of specific authority control identifiers, but that's another topic.)

Maybe not at all. Certainly VIAF is lacking some features we are
accustomed to find in more traditional authority control systems,
but if some people successfully start to use VIAF in lieu of
ordinary authority control, then my expectation on Bibframe would be
that VIAF based authority control should not work differently from
ordinary ones. So "VIAF" could serve as kind of litmus test for
Bibframe concepts ans properties - if they rely on "traditional"
features not present in VIAF they are lacking universality (in the
universe Bibframe is concerned with) and should be considered optional
at most.

viele Gruesse
Thomas Berger
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