On 1/13/15 8:17 AM, Robert Sanderson wrote:
This tells me that part of the definition of Annotation is that the annotation body is a digital object, not a real world object (RWO). And you contend that holdings information is a RWO. Have I understood your meaning correctly?I'm less concerned about exact definitions and more about the last case of HeldItem as a subClass of Annotation. Regardless of the exact definition, I suggest that it is impossible for the same resource to be both a real world physical object and a digital annotation at the same time.
If so, then my reply is truly in the definitions: Are there truly RWOs in library data? Library data has personal names, not persons. Book titles but not books.
Holdings data is a particularly odd one because there's a mixup between holdings (what library owns a resource and where it is located in the library) and item-level descriptive information (which is relatively rare in libraries but is primary in archives and museums).
Logically, there is a RWO, but illogically its physicality is described in what is defined in the cataloging rules as an abstract entity for a class of things (FRBR:Manifestation or BF:Instance). The actual physical item is often asserted solely by the presence of a barcode number. With this model, information about holdings (e.g. location) is just a digital resource that says something about another digital resource.
The larger question is: should library catalog data address "real world objects" and, if so, what are those objects? The multi-entity models, FRBR or BF, make this an even harder question, IMO, because there is nothing that represents the whole that the RWO is. Delegating the RWO to an annotation is pretty bad; not recognizing that the library description is more than an abstraction with a bar code is worse.