LDAPディレクトリの属性
https://docs.oracle.com/cd/E16340_01/core.1111/b56235/apusrole.htm
https://supportforums.cisco.com/document/129841/configure-directory-search-jabber-iphone
LDAPの手引き
http://www.cysol.co.jp/contrib/ldap/LDAPguide.doc
X.500
wikipedia:X.500