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INTRODUCTIONBibliographic relationships have been at the heart of cataloging theory for more than a century. They can be defined as an association, connection, or interaction between different bibliographic entities, or components of entities. The Functional Requirements for Bibliographic Records (FRBR) conceptual model is built on relationships between and among bibliographic entities. Bibliographic "relationships serve as the vehicle for depicting the link between one entity and another, and thus as the means of assisting the user to 'navigate' the universe that is represented in a bibliography, catalogue, or bibliographic database."1 Chapter five of the FRBR Final Report deals specifically with bibliographic relationships.These relationships are frequently expressed through the use of a note that indicates not only that a relationship exists among entities, but also clearly represents the nature of the relationship. In the FRBR model it is stated that a relationship is not valid unless the entities on each side of the relationship are explicitly identified.2 For example, statements such as "based on a novel by Moshe Gaash," "based on an animated short film," "based on a story by Barry Wong," do not explicitly establish a work-to-work relationship, while statements such as "based on the novel Spying on Dracula by Mary Labatt," and "based on the film Passione D'amore directed by Ettore Scola" clearly indicate the target of the relationship.Identification of bibliographic relationships allows users to navigate between related works and can help information systems designers organize large result sets in a way that is more useful to end users. Collocation devices such as uniform titles (Title of the Work in Resource Description and Access [RDA] 6.2) may be used to that effect although the collocating functions of current library catalogs are generally felt to be unsatisfactory by library users.