[1] RFC 2652 - MIME Object Definitions for the Common Indexing Protocol (CIP) (2015-05-03 22:21:07 +09:00 版) <https://tools.ietf.org/html/rfc2652#section-2.1.1>

[2] RFC 2651 - The Architecture of the Common Indexing Protocol (CIP) (2015-05-03 23:39:05 +09:00 版) <https://tools.ietf.org/html/rfc2651>

[3] RFC 2652 - MIME Object Definitions for the Common Indexing Protocol (CIP) (2015-05-03 22:21:07 +09:00 版) <https://tools.ietf.org/html/rfc2652>

[4] RFC 2653 - CIP Transport Protocols (2015-05-03 15:13:10 +09:00 版) <https://tools.ietf.org/html/rfc2653>