[1] RFC 5397 - WebDAV Current Principal Extension (2008-12-09 06:50:32 +09:00 版) <http://tools.ietf.org/html/rfc5397>
[2] RFC 5397 - WebDAV Current Principal Extension (2017-09-17 16:44:21 +09:00) <https://tools.ietf.org/html/rfc5397>