What is APPEL and what is its relationship to P3P?
APPEL (A P3P Preferences Exchange Language) is a W3C working draft that specifies a language for describing sets of preferences about P3P policies. Using this language, a user can express her preferences in a set of preference-rules (called a ruleset), which can then be used by her user-agent to make automated or semi-automated decisions regarding the exchange of data with P3P-enabled web sites. Primarily, we envision this language will be used to allow users to import preference rulesets created by other parties and to transport their own rulesets files between multiple user agents. We do not expect end users to learn the APPEL language or use it to create rulesets directly.
