From: Brian Candler <B.Candler@...>
Date: 2008-08-31T04:27:07+09:00
Subject: Re: How to use log4r to generate xml format log file?

> That's a good point. Nevertheless log4j does offer an XMLAppender.
> 
> It logs in 'XMLfragments' though - its up to you to complete the XML doc 
> when you come to parse the log though.

Does that mean it just appends fragments without a root element? So to parse
it, you have to prepend a <root> and append a </root> first?

> The Jabber chat/messaging (xml-router in fact) has the same issue

Not exactly: it sends a root element, and because it's a stream, the
receiver blocks waiting for more data.

  <stream>
    <message>
      ...
    </message>
    <message>
      ...
    </message>
                <---- at this point a stream parser waits
                      for either the closing </start> or another <message>

When the other side wants to close the connection it sends </stream> then
disconnects.

So taking the entirety of the stream, from when it starts to when it is
finished, it is valid XML and it can be parsed using a normal parser.

Regards,

Brian.