<version>1.0.0+</version>
          <type>String</type>
          <defaultValue>default</defaultValue>
          <required>true</required>
          <description>Item identifier.</description>
        </field>
      </fields>
    </class>
    <class rootElement="true" xml.tagName="settings">
      <name>Settings</name>
      <version>1.0.0+</version>
      <superClass>TrackableBase</superClass>