COMMENT ON --+--> objects-1 -+-> IS -+-> 'string' -+->
               +--> objects-2 -+       +---- / <-----+

  objects1 =

  -+> <table-name> -> ( + <col-name> IS +-> 'string' -++> ) --+->
   |                    |               +---- / <-----+|      |
   |                    +----------- , <---------------+      |
   +> CATALOG <catalog-name> ---------------------------------+
   +> COLLATING SEQUENCE <col-sequence-name> -----------------+
   +> COLUMN <table-name>.<col-name> -------------------------+
   +> CONSTRAINT <constraint-name> ---------------------------+
   +> DATABASE -+------------------------+--------------------+
   |            +-> ALIAS <alias-name> --+                    |
   +> DOMAIN <domain-name> -----------------------------------+
   +> FUNCTION <function-name> -------------------------------+
   +> INDEX <index-name> -+-------------------------------+---+
   |                      +-> PARTITION <partition-name> -+   |
   +> MODULE <module-name> -----------------------------------+
   +> PROCEDURE <procedure-name> -----------------------------+
   +> PROFILE <profile-name> ---------------------------------+

  objects2 =

  -+> ROLE <role-name> -----------------------------------------+-->
   +> SCHEMA <schema-name> -------------------------------------+
   +> SEQUENCE <sequence-name> ---------------------------------+
   +> STORAGE MAP <map-name> +--------------------------------+-+
   |                         +--> PARTITION <partition-name> -+ |
   +> SYNONYM <synonym-name> -----------------------------------+
   +> TABLE <table-name> ---------------------------------------+
   +> TRIGGER <trigger-name> -----------------------------------+
   +> USER <user-name> -----------------------------------------+
   +> VIEW <view-name> -----------------------------------------+