Minor

protocol.html

@@ -427,7 +427,7 @@ <h2 about="#introduction" property="schema:name" typeof="deo:Introduction">Intro
               <p>A goal of the protocol defined by this specification is to enable interaction patterns both for cases where an HTTP client maintains an open connection to receive notifications as well as for cases where an HTTP client makes a request for notifications and then disconnects.</p>
               <p>This specification is for:</p>
 
-              <ul rel="schema:audience">
+              <ul about="" rel="schema:audience">
                 <li><a href="http://data.europa.eu/esco/occupation/a7c1d23d-aeca-4bee-9a08-5993ed98b135">Server developers</a> that want to enable clients to listen for updates to particular resources.</li>
                 <li><a href="http://data.europa.eu/esco/occupation/c40a2919-48a9-40ea-b506-1f34f693496d">Application developers</a> who want to implement a client to listen for updates to particular resources.</li>
               </ul>