CREATE -+-> FUNCTION ---+-> <external-routine-name> ---------+
          +-> PROCEDURE --+                                    |
    +----------------------------<-----------------------------+
    +-+--------------------------------+-----------------------+
      +-> STORED NAME IS <identifier> -+                       |
    +----------------------------<-----------------------------+
    +-> ( -+-----------------------+-> ) ----------------------+
           ++-> parameter-list --+-+                           |
            +-------- , <--------+                             |
    +----------------------------<-----------------------------+
    +-+-------------------+--> --+------------------+-> ; --> -+
      +-> returns-clause -+      +-> LANGUAGE SQL --+          |
                                                               |
    +----------------------------<-----------------------------+
    +----> external-body-clause ---------------------------------->

  parameter-list =

  -+----------+-+-------------------+-+-> data-type -----+----------+
   +-> IN ----+ +> <parameter-name> + +-> <domain-name> -+          |
   +-> OUT ---+                                                     |
   +-> INOUT -+                                                     |
  +-----------------------------------------------------------------+
  +-+---------------------------+--+---------------------+----------+
    +-> DEFAULT value-expr -----+  +-> mechanism-clause -+          |
   +------------------------------<---------------------------------+
   ++---------------------------------+------------------------------->
    +-> COMMENT IS -+-> 'string' ---+-+
                    +------ / <-----+

  mechanism-clause =

  ----> BY --+-> DESCRIPTOR -+--->
             +-> LENGTH -----+
             +-> REFERENCE --+
             +-> VALUE ------+

  external-body-clause =

  --> EXTERNAL --+------------------------------+-------------+
                 +-> NAME <external-body-name> -+             |
  +----------------------------------- <----------------------+
  ++-----------------------------+-> LANGUAGE language-name --+
   +-> external-location-clause -+                            |
  +----------------------------------<------------------------+
  ++-> PARAMETER STYLE GENERAL -+-----------------------------+
   +-> GENERAL PARAMETER STYLE -+                             |
  +-----------------------------------<-----------------------+
  ++----------------------------+------------------------------>
   +-> external-body-clause-2 --+

  external-body-clause-2 =

  ---+--+-> COMMENT IS -+-> '<string> ' -+----+--+-->
     |  |               +------ / <------+    |  |
     |  +-> bind-site-clause -----------------+  |
     |  +-> bind-scope-clause ----------------+  |
     |  +-> notify-clause --------------------+  |
     |  +-> CALLED ON NULL INPUT -------------+  |
     |  +-> RETURNS NULL ON NULL INPUT -------+  |
     |  +-> USAGE IS -+-> LOCAL ---+----------+  |
     |  |             +-> GLOBAL --+          |  |
     |  +-+--------+--+-------------------+---+  |
     |    +-> NOT -+  +-> VARIANT --------+      |
     |                +-> DETERMINISTIC --+      |
     +---------------------- <-------------------+

  external-location-clause =

  ---+--> DEFAULT LOCATION ------------+-------------------------+
     +--> LOCATION '<image-location>' -+                         |
   +-------------------------------<-----------------------------+
   +-+----------------------------->--------------------------+-->
     +--> WITH --+-> ALL -----+--> LOGICAL_NAME TRANSLATION --+
                 +-> SYSTEM --+

  language-name =

  --+-> ADA -----+-->
    +-> C -------+
    +-> COBOL ---+
    +-> FORTRAN -+
    +-> PASCAL --+
    +-> GENERAL -+

  bind-site-clause =

  --> BIND ON --+--> CLIENT --+--> SITE --->
                +--> SERVER --+

  bind-scope-clause =

  ---> BIND SCOPE --+-> CONNECT ------+-->
                    +-> TRANSACTION --+

  notify-clause =

  -> NOTIFY notify-entry-name --> ON -+-+-> BIND ---------+-+->
                                      | +-> CONNECT ------+ |
                                      | +-> TRANSACTION --+ |
                                      +--------- , <--------+