if (src != null) {
            if (sourceDominant || target.getUnsubscribe() == null) {
                target.setUnsubscribe(src);
                target.setLocation("unsubscribe", source.getLocation("unsubscribe"));
            }
        }
    }

    protected void mergeMailingList_Post(
            MailingList target, MailingList source, boolean sourceDominant, Map<Object, Object> context) {

          </description>
          <type>String</type>
        </field>
        <field>
          <name>unsubscribe</name>
          <version>3.0.0+</version>
          <description>
            The email address or link that can be used to unsubscribe to
            the mailing list.  If this is an email address, a
            {@code mailto:} link will automatically be created