public XmlWriter WriteXML(XmlWriter xmlBuilder)
{
xmlBuilder.WriteStartElement("PDT");
if(!string.IsNullOrEmpty(A))
xmlBuilder.WriteAttributeString("A", A);
if(!string.IsNullOrEmpty(B))
xmlBuilder.WriteAttributeString("B", B);
if(F != null)
xmlBuilder.WriteAttributeString("F", ((int)F).ToString(CultureInfo.InvariantCulture));
xmlBuilder.WriteEndElement();
return xmlBuilder;
}