Machine Readable Cataloguing
21 (MARC 21): The MARC 21 is a standard format for the representation and
communication of bibliographic and related information in machine readable
form. The MARC 21 is a new name of harmonization of CANMARC and USMARC in a
single edition. In 1987, the Library of Congress issued the first edition of
the document MARC 21. Subsequent editions were published in 1990, 1994 and
2000.
a) Necessity of MARC 21: Mark 21 is necessary because of the following factors:
i) Lack of standardization among different national MARC formats;
ii) Lack of internationally accepted cataloguing code to MARC record;
iii) Diverse functions of bibliographic agencies;
iv) Lack of agreement among different bibliographic communities.
c) Standard Used in MARC 21
i) Cataloguing Code: AACR II;
ii) Subject Heading: LCSH;
iii) Classification Scheme: DDC;
iv) ISO 2709 and ANSI / NISO Z39.2.
a) Necessity of MARC 21: Mark 21 is necessary because of the following factors:
i) Lack of standardization among different national MARC formats;
ii) Lack of internationally accepted cataloguing code to MARC record;
iii) Diverse functions of bibliographic agencies;
iv) Lack of agreement among different bibliographic communities.
b) Maintenance of MARC 21: The
Library of Congress and the National Library of Canada serve as the maintenance
agency for MARC 21. The MARC 21 format, documentation and reviewing and
revision are done by the Machine Readable Bibliographic Information Committee
(MARBI). MARBI is a committee of the ALA. MARBI meets in conjunction with MARC
advisory committee at each American Library Association (ALA) conference.
c) Standard Used in MARC 21
i) Cataloguing Code: AACR II;
ii) Subject Heading: LCSH;
iii) Classification Scheme: DDC;
iv) ISO 2709 and ANSI / NISO Z39.2.
Till now, MARC
21 remains the standard one which is widely accepted in different library
softwares and also in different countries.
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