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The official list of MIME types, now renamed to media types

The digital content format descriptions accessible here provide specific information about individual formats and their characteristics. Each description provides moderately detailed information and citations. Planned for inclusion are a wide variety of formats: file formats, file-format classes, bitstream structures and encodings, and the mechanisms used to compress files or bitstreams. Inclusion of a description for a format does not imply that the format is preferred or acceptable for Library of Congress collections. [from homepage]

A collection of ontologies, controlled vocabularies, etc. indexed in the TIB Terminology Service