Abstract
This paper examines differences in modeling component parts of bibliographic resources between two conceptual models in cataloging, as a continuation of the previous study that proposed a model giving primacy to expression‐level bibliographic entity. First, the model by IFLA Study Group on Functional Requirements for Bibliographic Records (FRBR) was examined from the viewpoint of modeling component parts when each part in itself is a resource to be described. The examination is done on two types of component parts, a content part and a document part, which are different in terms of whether they are physically independent. This results in different structures for these two component types. Secondly, by applying the viewpoint to the model that the author proposed earlier, it has become clear that both component types can be modeled basically in the same manner, indicating the model's superiority in consistency to the FRBR model in this respect.