The WURFL is an XML configuration file which contains information about capabilities and features of many mobile devices.
The main scope of the file is to collect as much information as we can about all the existing mobile devices that access WAP pages so that developers will be able to build better applications and better services for the users.
http://wurfl.sourceforge.net/
WURFL stands for Wireless Universal Resource FiLe. It is part of a FOSS (which stands for Free and Open Source Software) community effort focused on the problem of presenting content on the wide variety of wireless devices. The WURFL itself is an XML configuration file which contains information about device capabilities and features for a variety of mobile devices. Device information is contributed by developers around the world and the WURFL is updated frequently reflecting new wireless devices coming on the market. Luca Passani is the driving force behind WURFL.
http://en.wikipedia.org/wiki/WURFL