The Value element defines the action values. Allow/deny or yes/no are examples of action values. Other action values can be either boolean, numeric, or strings. The values are defined in the service’s XML file (based on the sms.dtd). The Value element contains no other elements and it contains no XML service attributes.
Deny rules always take precedence over allow rules. For example, if one policy denies access and another allows it, the result is a deny (provided all other conditions for both policies are met). It is recommended that deny policies be used with extreme caution as they can lead to potential conflicts. If explicit deny rules are used, policies assigned to a user through different subjects (such as role and/or group membership) may result in denied access. Typically, the policy definition process should only use allow rules. The default deny may be used when no other policies apply.