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