CDO>  DEFINE CONTEXT SUBSCRIPTIONS BASE_PARTITION FOURTH_QUARTER.
  CDO>  SET CONTEXT SUBSCRIPTIONS
  CDO>  DEFINE COLLECTION MAIL_LABEL.
  CDO>  CONSTRAIN FIELD *

      In this example, the CONSTRAIN command controls all fields
      in the current default directory. See the ATTACH_TO_COMPOSITE
      command for commands to attach the constrained fields to this
      collection.