# File lib/fog/softlayer/requests/network/get_subnet_package_id.rb, line 14
        def get_subnet_package_id(address_space)
          address_space.downcase!; err_msg = "Argument for #{self.class.name}##{__method__} must be 'PRIVATE' or 'PUBLIC'."
          raise ArgumentError, err_msg unless %{private public}.include?(address_space)
          42
        end