This is the real reference site: http://www.ietf.org/rfc/rfc4918.txt

Setting properties

PROPPATCH /WebDavDocs/webdav-xml.htm HTTP/1.1
Host: myserver.com
Content-Type: text/xml
Content-Length: 138

<?xml version="1.0">
<d:propertyupdate xmlns:d="DAV:" xmlns:o="urn:schemas-microsoft-
com:office:office">
 <d:set>
    <d:prop>
       <o:Author>Sean Purcell</o:Author>
     </d:prop>
   </d:set>
</d:propertyupdate>

Server Response to above

HTTP/1.1 207 Multi-Status
Server: Microsoft-IIS/5.0
Date: Wed, 04 Aug 1999 21:52:58 GMT
Content-Type: text/xml
Content-Length: 310

<?xml version="1.0"?>
<a:multistatus xmlns:b="urn:schemas-microsoft-com:office:office" xmlns:a="DAV:">
  <a:response>
     <a:href>http://myserver.com/WebDavDocs/webdav-xml.htm</a:href>
     <a:propstat>
        <a:status>HTTP/1.1 200 OK</a:status>
        <a:prop>
           <b:Author/>
        </a:prop>
     </a:propstat>
  </a:response>
</a:multistatus>