    # File lib/fog/linode/requests/dns/domain_list.rb, line 26
            def domain_list(domain_id = nil)
              options = {}
              if domain_id
                options.merge!(:domainId => domain_id)
              end

              request(
                :expects  => 200,
                :method   => 'GET',
                :query    => { :api_action => 'domain.list' }.merge!(options)
              )
            end