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One good start in this topic is through the Drools engine (which is part of a large family of RedHat JBoss components). Already an XACML engine exists as a JBoss component called PicketBox, but this handles only XACML 2.0. Can you extend it to the current 3.0 version?
You may be spending time in the Tellu company, which has Drools at the core of their products and are interested in access control.