DECLARE -+------------------+-+
           +-> scope-options -+ |
  +-----------------------------+
  +-+------------+-  ALIAS FOR COMPILETIME -+
    +-> <alias> -+                          |
  +-------------------------<---------------+
  +-+-> FILENAME --> 'attach-spec ' -+------+
    +-> PATHNAME --> <path-name> ----+      |
  +------------------------<----------------+
  +-+------------------------------------+--+
    +-> lit-or-def-user-authentication --+  |
  +------------------------<----------------+
  +-+----------------------------+-+
    +-> RUNTIME runtime-options -+ |
  +-------------------------<------+
  +-+-+--------------------------------------------+-+->
    | +-> database-options ------------------------+ |
    | +-> attach-options --------------------------+ |
    | +-> DEFAULT CHARACTER SET support-char-set --+ |
    | +-> NATIONAL CHARACTER SET support-char-set -+ |
    | +-> DISPLAY CHARACTER SET support-char-set --+ |
    +----------------------- <-----------------------+

  lit-or-def-user-authentication =

  --> USER -+-> '<username>' -+--+--------------------------------+-->
            +->  DEFAULT -----+  +--> USING -+-> '<password>' --+-+
                                             +->  DEFAULT ------+

  scope-options =

  -+-> LOCAL --------------+-->
   +-> GLOBAL -------------+
   +-> EXTERNAL -----------+

  attach-spec =

  --+----------------+-> <file-spec> ----->
    +-> <node-spec> -+

  node-spec =

  -+-> <nodename> -+-------------------+-+->
   |               +-> <access-string> + |
   +------------------ :: <--------------+

  access-string =

  -+-> " <user-name> <password> " --+->
   +-> " <VMS-proxy-user-name> " ---+

  runtime-options =

   -+-> FILENAME --+-> '<attach-spec>' +-+--->
    |              +->  <parameter> ---+ |
    +-> PATHNAME --+->  <path-name> --+--+
    |              +->  <parameter> --+  |
    +-> runtime-string ------------------+

  runtime-string =

  -+> ' -+> FILENAME <attach-spec> -+-+---------------------+> ' +->
   |     +> PATHNAME <pathname> ----+ +> literal-user-auth -+    |
   +> parameter -------------------------------------------------+

  database-options =

  --+--> ELN ---------------------+-->
    +--> NSDS --------------------+
    +--> rdb-options -------------+
    +--> VIDA --------------------+
    +--> VIDA V1 -----------------+
    +--> VIDA V2 -----------------+
    +--> VIDA V2N ----------------+
    +--> NOVIDA ------------------+
    +--> DBIV1 -------------------+
    +--> DBIV31 ------------------+
    +--> DBIV70 ------------------+

   rdb-options =

   -+-> RDBVMS --+-->
    +-> RDB030 --+
    +-> RDB031 --+
    +-> RDB040 --+
    +-> RDB041 --+
    +-> RDB042 --+
    +-> RDB050 --+
    +-> RDB051 --+
    +-> RDB060 --+
    +-> RDB061 --+
    +-> RDB070 --+
    +-> RDB071 --+

  attach-options =

  -+-> DBKEY -+-> SCOPE IS -+-> ATTACH -------+-----------------------+->
   +-> ROWID -+             +-> TRANSACTION --+                       |
   +-> MULTISCHEMA IS -+-> ON --+-------------------------------------+
   |                   +-> OFF -+                                     |
   +-> PRESTARTED TRANSACTIONS ARE -+-> ON --+------------------------+
   |                                +-> OFF -+                        |
   +-+-------+-> RESTRICTED ACCESS -----------------------------------+
     +-> NO -+