To allow standardized 3rd party schema extensions for Active Directory to be imporable to Samba AD ldbmodify should support LDIF scripts. Specificylly this includes the following change operations ntdsSchemaAdd ntdsSchemaModify ntdsSchemaDelete ntdsSchemaModRdn schemaUpdateNow as described in https://msdn.microsoft.com/en-us/library/ms677268(v=vs.85).aspx