               <xf:output ref="@readonly"/>
                        <xf:trigger appearance="minimal">
                            <xf:label> [toggle]</xf:label>
                            <xf:setvalue ref="@readonly" value="(. + 1) mod 2" ev:event="DOMActivate"/>
                        </xf:trigger>
                    </xh:td>
                    <xh:td>
                        <xf:output ref="@required"/>
                        <xf:trigger appearance="minimal">
                            <xf:label> [t