public XmlWriter WriteXML(XmlWriter xmlBuilder)
{
xmlBuilder.WriteStartElement("PNT");
if(A != null)
xmlBuilder.WriteAttributeString("A", ((int)A).ToString(CultureInfo.InvariantCulture));
xmlBuilder.WriteAttributeString("C", C.ToString(CultureInfo.InvariantCulture));
xmlBuilder.WriteAttributeString("D", D.ToString(CultureInfo.InvariantCulture));
xmlBuilder.WriteAttributeString("E", E.ToString(CultureInfo.InvariantCulture));
xmlBuilder.WriteEndElement();
return xmlBuilder;
}