"Library holdings" is a kind of fluid concept; sometimes it means just
which library holds the item, as in some union catalogs; sometimes it
includes detailed information on location (Alcove B); sometimes it gets
into the number of copies; and of course, there are serial holdings,
which can vary from a brief statement to a couple of screens of issues
and numbers, bindings, etc.
In library catalogs, the holdings *display* today often includes
availability of the resource and a set of services offered. (see some
examples of holdings displays at http://kcoyle.net/holdings.html) It can
include statements about who is eligible for the services, especially in
the case of licensed electronic materials. Some example services are:
Place a hold; add to a list; export citation.
The schemabibex group , which is looking to extend schema.org for
bibliographic information, is working on some proposals   around
library holdings information. This is relevant to BIBFRAME because of
the potential uses of linked data, one of which would be to link Web
resources to library holdings (such as ).
I would like to see "services" as a concept added to BIBFRAME, whether
as part of holdings or as a separate annotation (although it may need to
annotate the holdings annotation, which currently is not covered in the
standard, since annotations can only annotation Works, Instances and
Authorities). To me it is a statement of commitment both to users and to
the integration of library services with the Web.
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