diff --git a/xep-0060.xml b/xep-0060.xml
index b35f8fc7..467acf5e 100644
--- a/xep-0060.xml
+++ b/xep-0060.xml
@@ -7083,6 +7083,12 @@ xmpp:pubsub.shakespeare.lit?pubsub;action=retrieve;node=princely_musings
     </xs:complexType>
   </xs:element>
 
+  <xs:simpleType name='empty'>
+    <xs:restriction base='xs:string'>
+      <xs:enumeration value=''/>
+    </xs:restriction>
+  </xs:simpleType>
+
 </xs:schema>
     ]]></code>
   </section2>