anchor.diff:  alterUser
       : ALTER USER
       ( 
  -      userName
  -      ( 
  -        IDENTIFIED (BY STRING (REPLACE STRING)? | (EXTERNALLY | GLOBALLY) ( AS STRING)?)
  -        | DEFAULT TABLESPACE ID
  -        | TEMPORARY TABLESPACE ID
  -        | (QUOTA (sizeClause | UNLIMITED) ON ID)
  -        | PROFILE ID
  -        | PASSWORD EXPIRE
  -        | ACCOUNT (LOCK | UNLOCK)
  -        | ENABLE EDITIONS (FOR ids)? FORCE?
  -        | CONTAINER EQ_ (CURRENT | ALL)
  -        | DEFAULT ROLE (roleNames| ALL (EXCEPT roleNames)?| NONE)
  -        | ID
  -     ) *
  -     | userNames proxyClause
  +        userName
  +        ( 
  +            IDENTIFIED (BY STRING (REPLACE STRING)? | (EXTERNALLY | GLOBALLY) ( AS STRING)?)
  +            | DEFAULT TABLESPACE ID
  +            | TEMPORARY TABLESPACE ID
  +            | QUOTA (sizeClause | UNLIMITED) ON ID
  +            | PROFILE ID
  +            | PASSWORD EXPIRE
  +            | ACCOUNT (LOCK | UNLOCK)
  +            | ENABLE EDITIONS (FOR ids)? FORCE?
  +            | CONTAINER EQ_ (CURRENT | ALL)
  +            | DEFAULT ROLE (roleNames| ALL (EXCEPT roleNames)?| NONE)
  +            | ID
  +        )*
  +        | userNames proxyClause
       ) 
       ;
   
   containerDataClause
       : (
  -        SET CONTAINER_DATA EQ_ ( ALL | DEFAULT | idList )
  -       |(ADD |REMOVE) CONTAINER_DATA EQ_ idList
  +          SET CONTAINER_DATA EQ_ ( ALL | DEFAULT | idList )
  +          | (ADD |REMOVE) CONTAINER_DATA EQ_ idList
       )
       (FOR schemaName? ID)?
       ;
  
positive.code:     ;
  
  grantee
      : userName 
      | roleName 
      | PUBLIC 
      ;
  
  granteeIdentifiedBy
  
negative.code:         NOT IDENTIFIED
          | IDENTIFIED (BY STRING| USING schemaName? ID| EXTERNALLY | GLOBALLY)
      )? 
      (CONTAINER EQ_ (CURRENT | ALL))? 
      ;
  
  alterRole
      : ALTER ROLE roleName
      (NOT IDENTIFIED | IDENTIFIED (BY STRING | USING schemaName? ID | EXTERNALLY | GLOBALLY))
      (CONTAINER EQ_ (CURRENT | ALL))? 
      ;
  
  dropRole
  