/// <summary>
/// Returns the <see cref="EvaluationContext"/> described by the element, if the element is itself a model.
/// </summary>
/// <returns></returns>
internal EvaluationContext GetSelfModelEvaluationContext()
{
return(obj.Interfaces <Model>()
.Select(i => i.DefaultEvaluationContext)
.FirstOrDefault(i => i != null));
}