MARC

MARC is a standard for library catalog metadata; there are various ways that it can be used at the Internet Archive.

Among them are if an item contains a properly named file, the metadata in that file will be automatically copied into the main IA metadata. The conventions are: {identifier}_marc.xml for a MARCXML, or {identifier}_meta.mrc for a binary (ISO 2709) MARC (note it is "_meta" not "_marc" for weird historical reasons).