    # File lib/fog/aws/requests/rds/describe_db_subnet_groups.rb, line 16
            def describe_db_subnet_groups(name = nil, opts = {})
              params = {}
              if opts[:marker]
                params['Marker'] = opts[:marker]
              end
              if name
                params['DBSubnetGroupName'] = name
              end
              if opts[:max_records]
                params['MaxRecords'] = opts[:max_records]
              end

              request({
                'Action'  => 'DescribeDBSubnetGroups',
                :parser   => Fog::Parsers::AWS::RDS::DescribeDBSubnetGroups.new
              }.merge(params))
            end