<p>The definition of each role in the model provides the following information :</p>
	<ul>
		<li>an informative description of the role;</li>
		<li>hierarchical information about related roles (e.g., a <rref>searchbox</rref> is a type of <rref>textbox</rref>);</li>
		<li>context of the role (e.g., a <rref>listitem</rref> is contained inside a <rref>list</rref>);</li>
		<li>references to related concepts in other specifications;</li>
		<li>supported <a>states</a> and <a>properties</a> for each role (e.g., a <rref>checkbox</rref> supports being checked via <sref>aria-checked</sref>).</li>
	</ul>