----------  Create or Drop Comment  ----------

Comments on a table, an attribute, a module, a routine or a trigger may be 
placed in the  data  dictionary  by the  "create comment" command.  The 
comments will then appear as output from a "display database",  "display 
table" or "display module"  command.  There are two variations:

Syntax:

 1) create comment [on] | table TABLE                  | [set] 'COMMENT_STRING';
                        | attr[ibute] TABLE.ATTR_NAME  |
                        | module MODULE                |
                        | routine MODULE.ROUTINE_NAME  |
                        | trigger TRIGGER              |

Syntax:

 2) comment [on] | table TABLE                 | [is] 'COMMENT_STRING';
                 | attr[ibute] TABLE.ATTR_NAME |
                 | module MODULE               |
                 | routine MODULE.ROUTINE_NAME |
                 | trigger TRIGGER             |

Note that when specifying TABLE.ATTR_NAME, the attribute must be qualified  by
its table name and by the keyword 'attr' or 'attribute'.  When specifying 
MODULE.ROUTINE_NAME, the routine must be qualified  by its module name and by 
the keyword 'routine'.

To remove comments on a table or attribute, the  "drop  comment"  command   is
used.

Syntax:

     drop comment [on]  | table TABLE                 |;
                        | attr[ibute] TABLE.ATTR_NAME |
                        | module MODULE               |
                        | routine MODULE.ROUTINE_NAME |
                        | trigger TRIGGER             |
