You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: soa.rb
    path of file: ./repos/metasploit-framework/lib/net/dns/rr
    
    the code of the file until where you have to start completion: # -*- coding: binary -*-
##
#
# Net::DNS::RR::SOA
#
#       $Id: SOA.rb,v 1.4 2006/07/28 07:33:36 bluemonk Exp $    
#
##

module Net
  modul
    
        def subclass_new_from_hash(args)
          if args.has_key? :rdata
            subclass_new_from_string(args[:rdata])
          else
            [:mname,:rname,:serial,:refresh,:retry,:expire,:minimum].each do |key|
              raise RRArgumentError, "Missing field :#{key}" unless args.has_key? key
            end
            @mname = args[:mname] if valid? args[:mname] 
            @rname = args[:rname] if valid? args[:rname]
            @serial = args[:serial] if number? args[:serial] 
            @refresh = args[:refresh] if number? args[:refresh] 
            @retry = args[:retry] if number? args[:retry] 
            @expire = args[:expire] if number? args[:expire] 
            @minimum = args[:minimum] if number? args[:minimum] 
          end