ref="../abstracts/attributes.html" title="Attributes">Attributes</a>).
        </p></td></tr>
</table></div>
<p>
        If no attribute is desired none needs to be specified. The default attribute
        type for both, grammars and rules, is <code class="computeroutput"><span class="identifier">unused_type</span></code>,
        which is a special placeholder type. Generally, using <code class="computeroutput"><span class="identifier">unused_type</span></code>
        as the attribute of a parser is inter