title: How to ignore unknown enum values in xml deserialization
body: <p>I found this link
  <a href="https://stackoverflow.com/questions/22752075/how-can-i-ignore-unknown-enum-values-during-json-deserialization">How can I ignore unknown enum values during json deserialization?</a>
  for json deserialization.</p>
  <p>is this same possible in xml deserialization?</p>
  <p>how can we achieve this by using IXmlSerializable intererface</p>