anchor.diff:  tcp_tcp          : L_PAREN PROTOCOL EQUAL TCP R_PAREN ;
                    
   host             : ID
  -                 | ID (DOT ID)+ 
  -                 | IP 
  +                 | IP
                    ;
   
   port             : INT ;
  
positive.code: alias_list       : alias (COMMA alias)* ;
  
  alias            : ID
                   | ID (DOT ID)+
                   ;
  
  //-----------------------------------------------------------------
  
negative.code:                  | cd_ur
                   ;
  
  cd_service_name  : L_PAREN SERVICE_NAME EQUAL ID R_PAREN ;
  
  cd_sid           : L_PAREN SID EQUAL ID R_PAREN ;
  
  cd_instance_name : L_PAREN INSTANCE_NAME EQUAL ID R_PAREN ;
  
  cd_failover_mode : L_PAREN FAILOVER_MODE EQUAL fo_params R_PAREN ;
  
  cd_global_name   : L_PAREN GLOBAL_NAME EQUAL ID R_PAREN ;
  
  cd_hs            : L_PAREN HS EQUAL OK R_PAREN ;
  
  