红帽全球峰会8.309. ref
ref 属性用于支持 LDAPv3 智能引用。此属性的值是 LDAP URL：
ldap:_host_name_:_port_number_/subtree_dn端口号是可选的。
例如：
ref: ldap://server.example.com:389/ou=People,dc=example,dc=com| OID | 2.16.840.1.113730.3.1.34 |
| 语法 | IA5String |
| 多或单值 | 多值 |
| 定义于 | LDAPv3 引用互联网存储 |
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