[1] [CITE@en[RFC 5397 - WebDAV Current Principal Extension]] ([TIME[2008-12-09 06:50:32 +09:00]] 版) <http://tools.ietf.org/html/rfc5397>

[2] [CITE@en[RFC 5397 - WebDAV Current Principal Extension]]
([TIME[2017-09-17 16:44:21 +09:00]])
<https://tools.ietf.org/html/rfc5397>