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The validationPolRef item is required, but the remaining items are optional.
The optional items are used to provide validation policy parameters.
When the client uses the validation policy's default values for all parameters, all of the optional items are absent. The validationAlg item specifies the validation algorithm. […]

The default validation policy MUST use the basic validation algorithm as its default validation algorithm.
When using the default validation policy, the client can override any of the default parameter values by supplying a specific value in the request.
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