<t:extend xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd"
          xmlns:p="tapestry:parameter">
    <t:replace id="exentsion">
        This component does not extend from another component, so it is not valid for it to use the &lt;t:extend&gt;
        element.
    </t:replace>
</t:extend>