The EAD document type

EAD Document Type Definition (DTD) is a standard for encoding archival finding aids using Extensible Markup Language (XML). The standard is maintained in the Network Development and MARC Standards Office of the Library of Congress (LC) in partnership with the Society of American Archivists.

Association rules

A file is considered to be a FO document when the it's namespace is urn:isbn:1-931666-22-9 or it's public ID is //DTD ead.dtd (Encoded Archival Description (EAD) Version 2002)//EN.