}
        }

        private void visit(ActivationFile activationFile) {
            if (activationFile != null) {
                String org, val;
                // Missing
                org = activationFile.getMissing();
                val = interpolate(org);
                if (org != val) {
                    activationFile.setMissing(val);
                }
                // Exists

          <description><![CDATA[
             Specifies that this profile will be activated based on existence of a file.
             ]]></description>
          <association>
            <type>ActivationFile</type>
          </association>
        </field>
      </fields>
    </class>

    <!-- TODO: reproduced from maven-model/maven.mdo, instead should inherit code and link to external docs -->
    <class>

          <version>1.0.0+</version>
          <description>
            Specifies that this profile will be activated based on existence of a file.
          </description>
          <association>
            <type>ActivationFile</type>
          </association>
        </field>
        <field>
          <name>packaging</name>
          <version>1.2.0+</version>
          <type>String</type>
          <description>