The purpose of this paper is to propose a way to adapt FRBR model more properly to digital resources. FRBR model is a conceptual model for the bibliographic universe to be dealt with in cataloging. This model was reported by IFLA Study Group on the Functional Requirements for Bibliographic Records. Two requirements for the adaptation of this model were drawn from the characteristics of digital resources. One is to represent resources in a flexible way regardless of whether they have a carrier or not (i.e., the difference between packaging resources and networked ones). The other is to represent the structural correspondence between content parts and file parts (i.e., the logical structure and the physical one of a resource). Simultaneously, two viewpoints necessary to define bibliographic entities were discussed: the viewpoint of evolving from an entity at an upper level to another at its lower level, and that of whole-part and part-part mapping between entity instances at different levels. These viewpoints should be used to adapt FRBR model to a certain type of resources. In order to satisfy the first requirement, at the basis of the first viewpoint, FRBR model was modified to a new one that consists of five bibliographic entities: work, expression, file, copy, and packaged copy. Then, from the second viewpoint, the new model was fully discussed whether it satisfies the second requirement and was finally confirmed to do that.
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