This paper discusses matters that are important to understand RDA but not described in RDA itself. First, the evaluation of RDA and the necessity of RDA implementation in Japan are described. Next, some matters that would be key points to understand RDA are discussed: a) RDA is based on FRBR and FRAD models, but it is proper to understand that RDA has its own model slightly different from FRBR/FRAD. b) There are several options and ways to implement RDA, and in particular RDA does not contain any guideline on encoding schema. The MARC21 format has been still used as the element set and syntax encoding for RDA metadata, while a new schema is under developed. c) RDA will bring users the FRBRization of OPACs, which enables users to search and display metadata in such a way that the FRBR model demonstrates. d) The RDA elements and controlled terms used in recording values have been registered in Open Metadata Registry so that RDA metadata would be toward the Linked Data.
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