A referral rule defines the resource whose policy definition and evaluation is being referred. By default, there are three OpenSSO Enterprise services enabled for policy referral.
Discovery Service (with resource name) allows administrators to create and manage policies for the OpenSSO Enterprise implementation of the Liberty Alliance Project
Liberty Personal Profile Service (with resource name)
URL Policy Agent (with resource name) allows administrators to create and manage policies for a policy agent. Policy agents enforce decisions on http/http(s) URLs.