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Mobile Location Services: The Definitive Guide by Andrew Jagoe

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4. Compact Policies

Compact policies are summarized P3P policies that provide hints to user agents to enable the user agent to make quick, synchronous decisions about applying policy. Compact policies are a performance optimization that is OPTIONAL for either user agents or servers. User agents that are unable to obtain enough information from a compact policy to make a decision according to a user's preferences SHOULD fetch the full policy.

In P3Pv1, compact policies contain policy information related to cookies only. The web server is responsible for building a P3P compact policy to represent the cookies referenced in a full policy. The policy specified in a P3P compact policy applies to data stored within all cookies set in the same HTTP response ...

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