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Start Of Authority resource.
Time in seconds that a secondary name server is to use the data before refreshing from the primary name server.
How often, in seconds, a secondary name server is to check for updates from the primary name server.
Creates a new SOA record.  See the attr documentation for the details of each argument.
 
               # File resolv.rb, line 1829
def initialize(mname, rname, serial, refresh, retry_, expire, minimum)
  @mname = mname
  @rname = rname
  @serial = serial
  @refresh = refresh
  @retry = retry_
  @expire = expire
  @minimum = minimum
end