DROP DATABASE --------------------------------------------------+
   +-------------------------- <----------------------------------+
   +-> ALIAS <alias> ---------------------------------------------+-->
   +-> FILENAME 'db-attach-spec' ------+-+----------------------+-+
   +-> PATHNAME <path-name> -----------+ +-> literal-user-auth -+

   db-attach-spec =

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

  node-spec =

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

  access-string =

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

  literal-user-auth =

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