RULE document_has_at_least_one_references

(* SCHEMA ship_moulded_form_schema; *)

  RULE document_has_at_least_one_references FOR (document);

    LOCAL
      violate : LOGICAL := FALSE;
      t1_set  : SET OF document := [];
      t2_set  : SET OF document_representation_type := [];
    END_LOCAL;
    t1_set := QUERY ( i <* document | VALUE_IN(which_class(i),'document') );
    REPEAT i := 1 TO HIINDEX(t1_set) BY 1 WHILE NOT violate;
      t2_set := bag_to_set(USEDIN(t1_set[i],
          'SHIP_MOULDED_FORM_SCHEMA.DOCUMENT_REPRESENTATION_TYPE.' + 
          'REPRESENTED_DOCUMENT'));
      violate := SIZEOF(t2_set) < 1;
    END_REPEAT;

  WHERE
    wr1: (NOT violate);

  END_RULE; -- document_has_at_least_one_references

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