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MARC 21 is a result of the combination of the United States and Canadian MARC formats (USMARC and CAN/MARC). MARC 21 is based on the NISO/ANSI standard Z39.2, which allows users of different software products to communicate with each other and to exchange data. [3] MARC 21 allows the use of two character sets, either MARC-8 or Unicode encoded ...
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 .
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.
Rules governing the creation of MARC catalog records include not only formal cataloging rules such as Anglo-American Cataloguing Rules, second edition (AACR2), [39] Resource Description and Access (RDA) [40] but also rules specific to MARC, available from both the U.S. Library of Congress and from OCLC, which builds and maintains WorldCat. [41]
In 2012, the Library of Congress announced that it had contracted with Zepheira, a data management company, to develop a linked data alternative to MARC. [5] Later that year, the library announced a new model called MARC Resources (MARCR). [6] That November, the library released a more complete draft of the model, renamed BIBFRAME. [1] [nb 1]
ArchiveGrid is a collection of over five million archival material descriptions, including MARC records from WorldCat and finding aids harvested from the web. [1] It contains archival collections held by thousands of libraries, museums, historical societies, and archives. [2]
Metadata elements grouped into sets designed for a specific purpose, e.g., for a specific domain or a particular type of information resource, are called metadata schemas. For every element the name and the semantics (the meaning of the element) are specified.
A bibliographic record is an entry in a bibliographic index (or a library catalog) which represents and describes a specific resource.A bibliographic record contains the data elements necessary to help users identify and retrieve that resource, as well as additional supporting information, presented in a formalized bibliographic format.