Dousa explained that the IFLA LRM represents a harmonization of the three conceptual models sometimes referred to as the "FRAMILY", that is FRBR (Functional Requirements for Bibliographic Records), FRAD (Functional Requirements for Authority Data), and FRSAD (Functional Requirements for Subject Authority Data).In the training period leading up to the introduction of RDA, many of us spent time wrestling with the FRBR WEMI model and the FRBR user tasks of Find, Identify, Select and Obtain.
The LRM presents an expanded suite of user tasks:
- Find - bring together information about one of more resources of interest ...
- Identify - clearly understand the nature of the resources found and distinguish between similar resources
- Select - determine the suitability of the resources found ...
- Obtain - access the content of the resource
- Explore - discover resources using the relationships between them, placing the resources in context
- Collective Agent
These entities function in an "is-a" hierarchy, where entities inherit the characteristics of entities further up in the hierarchy. Practically, all entities are subcategories of "res", and "person" and "collective agent" are subcategories of "agent".
The definition of "work" has been adjusted to read "the intellectual or artistic content of a distinct creation". It should be noted that works are modeled as coming into existence with the creation of an initial expression; there is no work without at least one expression of the work. The definition of "expression" has been adjusted to account for simultaneous creation with a work; the definitions of manifestation and item have also been adjusted.
Some additional things to keep in mind include the definition of "person" in a way that prohibits the treatment of fictional beings as persons , the concept of "nomen" defined as "an association between an entity and a designation that refers to it", and the idea of a "representative expression" as essential to characterizing a work.
The concept of relationships is central to the LRM. Currently 36 have been declared in the format [Entity A]<Relationship>[Entity B]. Relationships among the various WEMI entities form the core of the model.
How any of this will play out in the daily work of bibliographic description remains to be seen. The RDA Steering Committee has yet to finalize revisions to the RDA Toolkit, but it is my understanding that many cataloging policy decisions will be governed by application profiles.
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