Below is my NXLOG configuration file to parse

define ROOT C:\Program Files (x86)\nxlog

<Extension gelf>
  Module xm_gelf
</Extension>

Moduledir %ROOT%\modules
CacheDir %ROOT%\data
Pidfile %ROOT%\data\nxlog.pid
SpoolDir %ROOT%\data
LogFile %ROOT%\data\nxlog.log


<Extension multiline>
    Module          xm_multiline
    HeaderLine      /^<event>/
    EndLine         /^</event>/
</Extension>

<Extension xmlparser>
    Module          xm_xml
</Extension>

<Extension json>
    Module          xm_json
</Extension>

<Input filein>
    Module          im_file
    File            "C:\\test\\server\\Azurion\\SoftwarePackage\\test.xml"
    InputType       multiline
    <Exec>
        # Discard everything that doesn't seem to be an xml event
        if $raw_event !~ /^<event>/ drop();

        # Parse the xml event
        parse_xml();

        #Rewrite some fields
        $EventTime = parsedate($timestamp);
        delete($timestamp);
        delete($EventReceivedTime);

        # Convert to JSON
        to_json();
    </Exec>
</Input>

<Output fileout>
    Module          om_file
    File            "C:\\Users\\320005935\\Desktop\\new.txt"
</Output>

<Route parse_xml>
    Path            filein => fileout
</Route>

This is my XML file

<?xml version="1.0" encoding="UTF-8"?>
<event>
  <timestamp>2012-11-23 23:00:00</timestamp>
  <severity>ERROR</severity>
  <message>
    Something bad happened.
    Please check the system.
  </message>
</event>
<event>
  <timestamp>2012-11-23 23:00:12</timestamp>
  <severity>INFO</severity>
  <message>
   System state is now back to normal.
  </message>
</event>