public static void SerializeXmlElement(object obj, BinaryWriter writer, MemoryStream ms, ISurrogateContext context)
{
var node = obj as System.Xml.XmlElement;
var document = node.OwnerDocument;
string xpath;
var isFullXpath = XmlElementHelper.FindXPath(node, out xpath);
writer.Write(isFullXpath);
writer.Write(xpath);
if (!isFullXpath)
{
//In the case a node is not attached to a document (any node in its hierarchy has a null parent)
//the node is serialized by itself independently from the document.
writer.Write(XmlElementHelper.GetTopParentOuterXml(node));
}
}