The entities of the IFLA-LRM, RiC-CM and CIDOC-CRM models in the semantic web

The traditional approach to cataloguing has always been based on the investigation of the characteristics of the objects in collections that are most relevant to the construction of catalogues. The evolution of cataloguing theory has therefore led to the identification and analysis of entities with those characteristics and to the construction of a logical model capable of explaining bibliographic phenomena in an increasingly refined manner. That approach also led to the definition of RiCCM and CIDOC-CRM models. In addition to this valid point of view, a second perspective is proposed, which takes into account the entities identified in the logical models developed in the library, archive and museum models as part of the much larger, richer and more numerous ontologies of the semantic web, represented by the Linked Open Data Cloud. In this perspective, the logical models of libraries, archives, and museums can be seen as some of the possible infinite modelling of web entities, constructed in the light of the principles and tradition of each subject area. This new perspective helps to better clarify the role of data professionals, the concept of metadata, the characteristics of logical models and to take a unified view of the bibliographic, archival and museum universes.