RULE date_time_for_change_request

(* SCHEMA ship_structures_schema; *)

  RULE date_time_for_change_request FOR (applied_date_and_time_assignment, 
             date_time_role, versioned_action_request);

    LOCAL
      violate : LOGICAL := FALSE;
      t1_set  : SET OF versioned_action_request := [];
      a_set   : SET OF applied_date_and_time_assignment := [];
    END_LOCAL;
    t1_set := QUERY ( a <* versioned_action_request | VALUE_IN(
        which_class(a),'change request') );
    REPEAT i := 1 TO HIINDEX(t1_set) BY 1 WHILE NOT violate;
      a_set := QUERY ( b <* applied_date_and_time_assignment | (VALUE_IN(b
          .items,t1_set[i]) AND (b.role.name = 'date time')) );
      violate := SIZEOF(a_set) <> 1;
    END_REPEAT;

  WHERE
    wr1: (NOT violate);

  END_RULE; -- date_time_for_change_request

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2012-03-27T17:17:03-04:00