internal override void SetXML(XmlElement xml, BaseClassIfc host, HashSet<int> processed)
{
base.SetXML(xml, host, processed);
XmlElement element = xml.OwnerDocument.CreateElement("Elements");
xml.AppendChild(element);
foreach (IfcDerivedUnitElement unit in Elements)
element.AppendChild(unit.GetXML(xml.OwnerDocument, "", this, processed));
xml.SetAttribute("UnitType", mUnitType.ToString().ToLower());
setAttribute(xml, "UserDefinedType", UserDefinedType);
}