anchor.diff:      : ID *?
       ;
   
  -
  -granteeClause
  +grantees
       : grantee (COMMA grantee)*
       ;
       
  
positive.code:     
  programUnit
      : (FUNCTION | PROCEDURE | PACKAGE) schemaName? ID
      ;
negative.code:     ;
      
  grantSystemPrivileges
      : systemObjects TO (grantees | granteeIdentifiedBy) (WITH (ADMIN | DELEGATE) OPTION)?
      ; 
      
  systemObjects
  