A P3P Preference Exchange Language (APPEL)
This chapter has devoted a lot of time to P3P, which enables Web sites to express their privacy policy. APPEL[21] is an XML-based language that provides a means for individuals to indicate their privacy preferences, which can be compared against a Web site's policy. The user can use APPEL rules to instruct a Web browser to complete, limit, or block the request for a Web resource. Limiting a request results in cookies and referrer headers being blocked.
When defining a rule, the behavior must first be defined. The choices are continue, limited, or block. The user can choose to be prompted when a rule fires, to be given a chance to override the specified behavior. ...
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