AGGREGATES AND CATEGORIES OF AGGREGATES.

The term aggregate was first used in the context of bibliography in the FRBR (Functional Requirements for Bibliographic Records) published in 1998. At that time, the precise definition of aggregate had not yet been defined. The breakthrough was achieved by the Working Group on Aggregates set up by IFLA. In its 2011 final report, the Working Group defined the definition of aggregate and the main types of aggregate. These definitions have been adopted in the IFLA Library Reference Model. As aggregates are a relatively common record type in catalogues, the aim of this paper is to summarise what an aggregate is, what types of aggregates are distinguished and how to model these type. [ABSTRACT FROM AUTHOR]