The UAProf (User Agent Profile) specification is concerned with capturing capability and preference information for wireless devices. This information can be used by content providers to produce content in an appropriate format for the specific device. It is an XML document that contains information about the user agent type and device capabilities. It is a standard defined and maintained by the Open Mobile Alliance.
UAProf is related to the Composite Capability/Preference Profiles Specification created by the World Wide Web Consortium.
UAProf files typically have the file extensions rdf or xml, and are usually served with mimetype application/xml. They are an XML-based file format. The RDF format means that the document schema is extensible. User agent profiles are stored in a server called the profile repository. Very often a profile repository is maintained by a mobile device manufacturer. For example, the user agent profiles describing the capabilities of Nokia cell phones are stored in a profile repository maintained by Nokia.
A UAProf file describes the capabilities of a mobile handset, including Vendor, Model, Screensize, Multimedia Capabilities, Character Set support, and more. Recent UAProfiles have also begun to include data conforming to MMS, PSS5 and PSS6 schemas, which includes much more detailed data about video, multimedia, streaming and MMS capabilities.
A mobile handset sends a header within an http request, containing the URL to its UAProf. The http header is usually X-WAP-Profile:, but sometimes may look more like 19-Profile:, WAP-Profile: or a number of other similar headers.
UAProf production for a device is voluntary: for GSM devices, the UAProf is normally produced by the vendor of the device (e.g. Nokia, Samsung, LG) whereas for CDMA / BREW devices it's more common for the UAProf to be produced by the telecommunications company.
Samsung UAProf: http://wap.samsungmobile.com/uaprof/GT-I9190.xml
Nokia UAProf: http://developer.nokia.com/gen/all_devices.rss
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