Update protocol.html

Author: csarven

protocol.html

@@ -743,7 +743,7 @@ <h4 property="schema:name">Modifying Resources Using N3 Patches</h4>
 
                     <ul about="#server-patch-n3-default">
                       <li id="server-patch-n3-single" rel="spec:requirement" resource="#server-patch-n3-single"><span property="spec:statement">The patch document <span rel="spec:requirementLevel" resource="spec:MUST">MUST</span> contain exactly one patch resource, identified by one or more of the triple patterns described above, which all share the same <code>?patch</code> subject.</span></li>
-                      <li id="server-patch-n3-simple-type" rel="spec:requirement" resource="#server-patch-n3-type">A patch resource <span rel="spec:requirementLevel" resource="spec:MAY">MUST</span> contain a triple <code><span property="spec:statement">?patch rdf:type solid:InsertDeletePatch</span></code>.</li>
+                      <li id="server-patch-n3-simple-type" rel="spec:requirement" resource="#server-patch-n3-type">A patch resource <span rel="spec:requirementLevel" resource="spec:MUST">MUST</span> contain a triple <code><span property="spec:statement">?patch rdf:type solid:InsertDeletePatch</span></code>.</li>
                       <li id="server-patch-n3-variables" rel="spec:requirement" resource="#server-patch-n3-variables"><span property="spec:statement">The <code>?insertions</code> and <code>?deletions</code> formulae <span rel="spec:requirementLevel" resource="spec:MUST-NOT">MUST NOT</span> contain variables that do not occur in the <code>?conditions</code> formula.</span></li>
                       <li id="server-patch-n3-blank-nodes" rel="spec:requirement" resource="#server-patch-n3-blank-nodes"><span property="spec:statement">The <code>?insertions</code> and <code>?deletions</code> formulae <span rel="spec:requirementLevel" resource="spec:MUST-NOT">MUST NOT</span> contain blank nodes.</span></li>
                     </ul>