message: Removed unneeded lines
diff: <element name="member">
  <a:documentation>Item define in the serializable object.</a:documentation>
  + <!-- Optional element -->
  +
  <optional>
  <a:documentation>Optional default value.</a:documentation>
  <element name="default">
  </attribute>
  </optional>
  -
  -
  <!-- Type, size, and internal enum define are defined within this ref -->
  <ref name="type_size_choice_define"/>
  </element>
  