Good points. We are also troubled by the inheritance implications of a WEMI model realized in RDF. In the OCLC linked data model of works, every description is modeled as a schema:CreativeWork and is capable of standing alone. So an Item description could have titles, subjects, authors, and so on, which might be factored out to Works, Expressions, and Manifestations in a hierarchical model. We are still debating among ourselves whether this result is theoretically interesting, or whether it's a concession to the reality of working with aggregated data. But I'm wondering where BF stands on this issue.
Jean and Jeff,
Questions and minor issues
- How are the properties partitioned among 'Instance and 'Item'? The example described in the Proposal document implies that the 'Item' class contains only properties indicating uniqueness -- such as shelf location, bar code, etc -- while Instance would contain properties such as 'contributor,' 'creation date,' and 'custodial history.' Is this correct? Or is there any bleeding between the Instance/Item line? For example, can an Item have an author or title, or is that information always maintained in the corresponding Instance description?
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