RULE sheets_belong_to_one_drawing

(* SCHEMA associative_draughting; *)

  RULE sheets_belong_to_one_drawing FOR (drawing_sheet_revision, 
             drawing_sheet_revision_usage);

  WHERE
    wr1: SIZEOF(QUERY ( dsr <* drawing_sheet_revision | (NOT (SIZEOF(
             QUERY ( usage <* drawing_sheet_revision_usage | (dsr :=: usage
             .area) )) = 1)) )) = 0;

  END_RULE; -- sheets_belong_to_one_drawing

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