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

[2] [CITE@en[mets]]
([TIME[2017-07-09 00:17:28 +09:00]])
<https://github.com/mets>

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

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