diff --git a/content/datenspuren/stream.xml b/content/datenspuren/stream.xml
index a53ea4cb2..ae1766521 100644
--- a/content/datenspuren/stream.xml
+++ b/content/datenspuren/stream.xml
@@ -2,8 +2,9 @@
 
 <page title="Videostream">
   <video xmlns="http://www.w3.org/1999/xhtml"
-	 src="http://stream.datenspuren.de:8000/Datenspuren_grSaal.ogg"
 	 controls="controls" autoplay="autoplay">
+    <source type="video/ogg"
+	    src="http://stream.datenspuren.de:8000/Datenspuren_grSaal.ogg"/>
   </video>
   <p>
     Eine Übersicht zu den Streams gibt es auf der
diff --git a/xsd/xhtml1-strict.xsd b/xsd/xhtml1-strict.xsd
index fd2be196c..0339a264e 100644
--- a/xsd/xhtml1-strict.xsd
+++ b/xsd/xhtml1-strict.xsd
@@ -2223,13 +2223,20 @@
   <!-- HACK :-) -->
   <xs:element name="video">
     <xs:complexType mixed="true">
-      <xs:attributeGroup ref="attrs"/>
-      <xs:attribute name="src" type="URI"/>
+      <xs:sequence>
+        <xs:element maxOccurs="unbounded" ref="source"/>
+      </xs:sequence>
       <xs:attribute name="height" type="Length"/>
       <xs:attribute name="width" type="Length"/>
       <xs:attribute name="controls" type="Text"/>
       <xs:attribute name="autoplay" type="Text"/>
     </xs:complexType>
   </xs:element>
+  <xs:element name="source">
+    <xs:complexType mixed="true">
+      <xs:attribute name="src" type="URI"/>
+      <xs:attribute name="type" type="Text"/>
+    </xs:complexType>
+  </xs:element>
 
 </xs:schema>