</a> is valid against its matching <a href="questionnaire.html">Questionnaire</a></li>
<li><b>Business Rules</b>: Business rules are made outside the specification, such as checking for duplicates, checking that references resolve, checking that a user is authorized to do what they want to do, etc.</li>
</ul>

<p>
There are multiple ways to validate resources. This table summarizes the options
described in this specification, and which of the aspects above they can validate:
</p>

<table class="gri