Use xs:base64Binary in XEP-0300's schema

xep-0300.xml

@@ -24,6 +24,12 @@
   &mwild;
   &ksmith;
   &tobias;
+  <revision>
+    <version>0.5.1</version>
+    <date>2017-03-17</date>
+    <initials>fs</initials>
+    <remark><p>Use xs:base64Binary instead of xs:string in the schema</p></remark>
+  </revision>
   <revision>
     <version>0.5</version>
     <date>2017-01-24</date>
@@ -380,7 +386,7 @@
   <xs:element name='hash'>
     <xs:complexType>
       <xs:simpleContent>
-        <xs:extension base='xs:string'>
+        <xs:extension base='xs:base64Binary'>
           <xs:attribute name='algo' type='xs:NCName' use='required'/>
         </xs:extension>
       </xs:simpleContent>
@@ -392,7 +398,8 @@
 </section1>
 
 <section1 topic='Acknowledgements' anchor='ack'>
-  <p>Thanks to Dave Cridland, Waqas Hussain, Glenn Maynard, and Remko Tronçon for their input.</p>
+  <p>Thanks to Dave Cridland, Waqas Hussain, Glenn Maynard, Remko
+  Tronçon, and Christian Schudt for their input.</p>
 </section1>
 
 </xep>