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MARC 21 was designed to redefine the original MARC record format for the 21st century and to make it more accessible to the international community. MARC 21 has formats for the following five types of data: Bibliographic Format, Authority Format, Holdings Format, Community Format, and Classification Data Format. [ 3 ]
As an XML schema it is intended to be able to carry selected data from existing MARC 21 records as well as to enable the creation of original resource description records. It includes a subset of MARC fields and uses language-based tags rather than numeric ones, in some cases regrouping elements from the MARC 21 bibliographic format.
In the late 1960s the MARC format was developed under the direction of Henriette Avram at the Library of Congress to encode the information printed on library cards. [2] It standardized in the early 1970s as ANSI/NISO Standard Z39.2-1971 and ISO 2709-1973.
Henriette Davidson Avram (October 7, 1919 – April 22, 2006) was a computer programmer and systems analyst who developed the MARC format (Machine Readable Cataloging), the international data standard for bibliographic and holdings information in libraries.
MARC standards for authority records in machine-readable format. [23] Metadata Authority Description Schema (MADS), an XML schema for an authority element set that may be used to provide metadata about agents (people, organizations), events, and terms (topics, geographics, genres, etc.).
These records, available online free-of-charge and typically in MARC 21 format, contain a variety of identifying and annotative remarks on these entities — such as alternative or full names of people and organisations, date or year of birth of authors of books or subjects of books, cross-referencing of affiliated entities, and so on.
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The MARC-8 charset is a MARC standard used in MARC-21 library records. [1] The MARC formats are standards for the representation and communication of bibliographic and related information in machine-readable form, and they are frequently used in library database systems.