trace: Str("Attribute named 'optionD' does not match any option declaration.",[])
<?xml version='1.0' encoding='utf-8'?>
<expr>
  <attrs>
    <attr name="optionA">
      <bool value="true" />
    </attr>
    <attr name="optionB">
      <bool value="true" />
    </attr>
    <attr name="optionC">
      <bool value="false" />
    </attr>
    <attr name="optionD">
      <list>
        <bool value="false" />
      </list>
    </attr>
  </attrs>
</expr>