Page Comparison

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1. Examines all the <AttributeFilterPolicyGroup> elements provided (for instance across multiple files) in an unspecified order.

2. Examines all the <AttributeFilterPolicy> elements within each <AttributeFilterPolicyGroup>, again in an unspecified order.

3. For each policy, if the <PolicyRequirementRule> is true:

   1. Applies each of the child <AttributeRule> elements, such that:

      1. The attributes (and their values) returned by <PermitValueRule> get added to a "permit list".

      2. The attributes (and their values) returned by <DenyValueRule> get added to a "deny list".

4. At the end of filtering, the final results are calculated by:

   1. Populating the result initially from the permit list.

   2. Removing all attribute values found in the deny list.

   3. Removing all attributes with no values.

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