curl -i http://127.0.0.1:2113/streams/newstream/event/1?format=xml

gistfile1.xml

ouro@ouroboros$ curl -i http://127.0.0.1:2113/streams/newstream/event/1 -H "Accept: text/xml"
HTTP/1.1 200 OK
Access-Control-Allow-Methods: GET
Content-Type: text/xml
Server: Mono-HTTPAPI/1.0
Date: Thu, 13 Sep 2012 10:55:13 GMT
Content-Length: 312
Keep-Alive: timeout=15,max=100

<?xml version="1.0" encoding="UTF-8"?>
<ReadEventCompletedText>
   <correlationId>680fccc2-3c6c-4ed0-ad8a-b952bd446873</correlationId>
   <eventStreamId>newstream</eventStreamId>
   <eventNumber>1</eventNumber>
   <eventType>Type</eventType>
   <data>
       <Foo>Bar</Foo>
   </data>
   <metadata>
      <Foo>Bar</Foo>
   </metadata>
</ReadEventCompletedText>

I fixed correlationId and metadata in my fork to match simpledocument.txt given in previous examples.