WURFL stands for Wireless Universal Resource FiLe. It is a community effort focused on mobile device detection

Mobile device detection

Mobile Device Detection refers to software that identifies the type of mobile device visiting a web site and either redirects the end user to a dedicated mobile web site or adapts the format of the web site to suit the end user’s device....

: the problem of presenting content on the wide variety of wireless devices. WURFL is a set of proprietary API's and an XML

XML

Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....

 configuration file which contains information about device capabilities and features for a variety of mobile devices. Until version 2.2, WURFL was release under an "open source / public domain" licensePrior to Version 2.2 device information was contributed by developers around the world and the WURFL was updated frequently reflecting new wireless devices coming on the market.