[1] [CITE@en[RFC 6839 - Additional Media Type Structured Syntax Suffixes]]
( ([TIME[2013-06-28 00:23:48 +09:00]] 版))
<http://tools.ietf.org/html/rfc6839#section-3>

[2] [CITE@en[RFC 6839 - Additional Media Type Structured Syntax Suffixes]]
( ([TIME[2013-09-29 07:47:38 +09:00]] 版))
<http://tools.ietf.org/html/rfc6839#section-3.2>