Schema Extension 1. Content of the Schema Extension The schema extension is very minimal. It is composed of three object classes (webadmAccount, webadmGroup and webadmConfig) and three attributes (webadmSettings, webadmData and webadmType). Each attribute contains a registered object identifier. 34617 corresponds to the registered number for RCDevs at IANA. 2. Automatic Schema Extension This option is preferred and is very easy. It works with most of LDAP servers. 2.1 Active Directory Prerequisite The first domain controller defined in /opt/webadm/conf/servers.