nd the ActivityPub specification.</p>
<h2><a href="#the-object-type" name="the-object-type"></a>The <code>Fault</code> object type</h2>
<p>The <code>Fault</code> object type is a novel object type introduced by this document to describe validation faults. Objects with the <code>Fault</code> object type MUST have at least the following fields (additional fields are not required but are optional):</p>
<ol>
  <li><code>:@context</code> whose value shall be the URL of a document specifying this vocabulary;</li>