ALTER MODULE <module-name> -+-> alter-module-clauses -+-+----------------+--->
                              +-----------<-------------+ +-> END MODULE --+

  alter-module-clauses =

  -+-> ADD routine-clause ---------------+->
   +-> COMMENT IS +-> '<text-literal>' -++
   |              +------- / <----------+|
   +-> COMPILE --------------------------+
   +-> drop-routine-clause --------------+
   +-> RENAME TO <new-module-name> ------+

  drop-routine-clause =
  DROP -+-> FUNCTION --+> <routine-name> -+-+---------------+-+->
        +-> PROCEDURE -+                  | +-> CASCADE ----+ |
                                          | +-> RESTRICT  --+ |
                                          | +-> IF EXISTS --+ |
                                          +----------<--------+