public string ToXMLFragment()
 {
     IMwsWriter writer = new MwsXmlBuilder(false, System.Xml.ConformanceLevel.Fragment);
     this.WriteFragmentTo(writer);
     return writer.ToString();
 }
 public string ToXML()
 {
     IMwsWriter writer = new MwsXmlBuilder();
     this.WriteTo(writer);
     return writer.ToString();
 }