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MARC 21
MARC21 is the main metadata record file format used within institutional libraries. It is partially compatible with MARCXML. MARC21 ought to be phased out, but considering the enormous amounts of often idiosyncratic records in every single library this seems unlikely in the future.
MARC21 specifications are maintained by the Library of Congress.
"marc exchange" is apparently "the ISO 2709 standard", and "MARC21" is apparently "an instance of the ISO 2709 standard", and ".mrc" is apparently a "binary MARC file", and the examples of it in the rust crate do indeed look like marc exchange/marc 21 (whereas ".mrk" is a "mnemonic MARC text file", which is more or less the ".mrc" version broken up into lines for ease of reading)
Conversion toolkit to/from MARCXML: https://www.loc.gov/standards/marcxml/
MARC 21 has formats for the following five types of data: Bibliographic Format, Authority Format, Holdings Format, Community Format, and Classification Data Format. Within the Bibliographic Format, there are specific fields to include accessibility metadata.
The Thoth Wiki has been developed in the context of the COPIM (Community-led Open Publication Infrastructures for Monographs) project. Individual contributions to the wiki have been made by Tim Elfenbein, Joanne Fitzpatrick, Rupert Gatti, Ross Higman, Hannah Hillen, Brendan O'Connell, Tobias Steiner, and Vincent W.J. van Gerven Oei under the general editorship of Van Gerven Oei. All data are available under a CC-BY 4.0 license.