Encoding e Indentar xml

Dim xml_test As New XmlDocument
            xml_test.LoadXml(xml)
            Dim setting As New XmlWriterSettings
            setting.Indent = True
            setting.Encoding = System.Text.Encoding.GetEncoding("ISO-8859-1")
            Dim out As XmlWriter = XmlWriter.Create("archivo.xml", setting)
            xml_test.Save(out)
            out.Close()