hmm, dont know. but I can post the content of my Tracker.xml file if it helps you:
<?xml version="1.0"?>
<root xmlns="urn:schemas-upnp-org:device-1-0" xmlns:dlna="urn:schemas-dlna-org:device-1-0">
<specVersion>
<major>1</major>
<minor>0</minor>
</specVersion>
<device>
<deviceType>urn:schemas-upnp-org:device:MediaServer:2</deviceType>
<UDN>uuid:e37c6c92-7c41-407c-9a37-e0dc15fcec11</UDN>
<friendlyName>Nokia-N900</friendlyName>
<manufacturer>Rygel Developers.</manufacturer>
<manufacturerURL>http://live.gnome.org/Rygel</manufacturerURL>
<modelName>Rygel</modelName>
<modelNumber>0.1</modelNumber>
<modelDescription/>
<serialNumber>0000001</serialNumber>
<UPC/>
<presentationURL/>
<serviceList><service><serviceType>urn:schemas-upnp-org:service:ContentDirectory:2</serviceType><serviceId>urn:upnp-org:serviceId:ContentDirectory</serviceId><SCPDURL>xml/ContentDirectory.xml</SCPDURL><eventSubURL>Tracker/RygelMediaTracker/Event</eventSubURL><controlURL>Tracker/RygelMediaTracker/Control</controlURL></service><service><serviceType>urn:schemas-upnp-org:service:ConnectionManager:2</serviceType><serviceId>urn:upnp-org:serviceId:ConnectionManager</serviceId><SCPDURL>xml/ConnectionManager.xml</SCPDURL><eventSubURL>Tracker/RygelSourceConnectionManager/Event</eventSubURL><controlURL>Tracker/RygelSourceConnectionManager/Control</controlURL></service></serviceList>
<dlna:X_DLNADOC>DMS-1.50</dlna:X_DLNADOC>
<dlna:X_DLNADOC>M-DMS-1.50</dlna:X_DLNADOC>
<dlna:X_DLNACAP/>
<iconList><icon><mimetype>image/png</mimetype><width>48</width><height>48</height><depth>24</depth><url>/Tracker-48x48x24.png</url></icon></iconList></device>
</root>