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: pass:quotes[host_name]:pass:quotes[port_number]/pass:quotes[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 |
| multi- 或 Single-Valued | 多值 |
| 定义在 | LDAPv3 Referrals Internet Draft |
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