/// <summary>
/// Gets the annotation elements for a <see cref="XNode"/>.
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
IEnumerable<XElement> SerializeNodes(XNode node)
{
Contract.Requires<ArgumentNullException>(node != null);
foreach (var annotation in node.Annotations<object>())
{
var obj = SerializeAnnotation(node, annotation);
if (obj != null)
{
obj.SetAttributeValue(NX_FOR, NX_FOR_NODE);
yield return obj;
}
}
}