anchor.diff:  # you need to do the reverse notation yourself.
   # local-data-ptr: "192.0.2.3 www.example.com"
   server:
  +<% if @local_zone %>
     local-zone: "<%= @local_zone['id'].gsub(/_/, ".") %>." static
     <% @local_zone['ns'].each do |rr| -%>
       <% rr.each do |fqdn,ip| -%>
  
positive.code: # defaults are localhost address, reverse for 127.0.0.1 and ::1
  # and nxdomain for AS112 zones. If you configure one of these zones
  # the default content is omitted, or you can omit it with 'nodefault'.
  # 
  # If you configure local-data without specifying local-zone, by
  # default a transparent local-zone is created for the data.
  #
  
negative.code:   local-data: "<%= fqdn %>. 10800 IN A <%= ip %>"
      <% end -%>
    <% end -%>
  <% end %>
  