The formatting of a nice message for this event hasn't been implemented yet, so 
I'll just put an XML dump of the event here.

<ns:documentTypeUpdated xmlns:ns="http://outerx.org/daisy/1.0";>
  <ns:oldDocumentType>
    <ns:documentType id="5" lastModified="2005-10-23T12:51:58.000Z" 
lastModifier="123" name="CocoonDocument" deprecated="false" updateCount="2">
      <ns:labels>
        <ns:label locale="">Cocoon Document</ns:label>
      </ns:labels>
      <ns:descriptions>
        <ns:description locale="">Use this for all Cocoon documentation, unless 
a more specific document type is available.</ns:description>
      </ns:descriptions>
      <ns:partTypeUses>
        <ns:partTypeUse partTypeId="2" required="true"/>
      </ns:partTypeUses>
      <ns:fieldTypeUses/>
    </ns:documentType>
  </ns:oldDocumentType>
  <ns:newDocumentType>
    <ns:documentType id="5" lastModified="2006-03-03T15:37:21.604Z" 
lastModifier="123" name="CocoonDocument" deprecated="false" updateCount="3">
      <ns:labels>
        <ns:label locale="">Cocoon Document</ns:label>
      </ns:labels>
      <ns:descriptions>
        <ns:description locale="">Use this for all Cocoon documentation, unless 
a more specific document type is available.</ns:description>
      </ns:descriptions>
      <ns:partTypeUses>
        <ns:partTypeUse partTypeId="2" required="true"/>
      </ns:partTypeUses>
      <ns:fieldTypeUses>
        <ns:fieldTypeUse fieldTypeId="20" required="false"/>
        <ns:fieldTypeUse fieldTypeId="18" required="false"/>
        <ns:fieldTypeUse fieldTypeId="17" required="false"/>
      </ns:fieldTypeUses>
    </ns:documentType>
  </ns:newDocumentType>
</ns:documentTypeUpdated>