[1] Metadata Encoding and Transmission Standard (METS) Official Web Site | Library of Congress (2016-08-09 23:07:35 +09:00) http://www.loc.gov/standards/mets/

[2] mets (2017-07-09 00:17:28 +09:00) https://github.com/mets

[3] Using ALTO with METS · altoxml/documentation Wiki (2017-07-09 00:17:38 +09:00) https://github.com/altoxml/documentation/wiki/using-ALTO-with-METS

[4] Metadata Encoding and Transmission Standard (METS) Official Web Site | Library of Congress (2020-09-21T00:31:15.000Z, 2020-10-14T05:29:57.131Z) https://www.loc.gov/standards/mets/