anchor.diff:      | rbnx_n_af_inherit
       | rbnx_n_af_maximum_prefix
       | rbnx_n_af_next_hop_self
  -    | rbnx_n_af_next_help_third_party
  +    | rbnx_n_af_next_hop_third_party
       | rbnx_n_af_prefix_list
       | rbnx_n_af_route_map
       | rbnx_n_af_route_reflector_client
  
positive.code:     NEXT_HOP_SELF NEWLINE
  ;
  
  rbnx_n_af_next_help_third_party
  :
      NEXT_HOP_THIRD_PARTY NEWLINE
  ;
  
negative.code: 
  rbnx_n_address_family
  :
      ADDRESS_FAMILY first = (IPV4 | IPV6) second = (MULTICAST | UNICAST) NEWLINE
      rbnx_n_af_inner*
  ;
  
  