摘要: eXtensible Access Control Markup Language (XACML), an OASIS standard, is the most widely used policy specifica- tion language for access control. Its simplicity in syntax and strength coverage makes it suitable diverse en- vironments such as Service Oriented Architectures (SOAs) P2P systems. There are different implementations of XACML available. Some these open source some others proprietary. In this work we intended to shed lights performance issues engines. We tested 3 with policy/request settings. Our experiments revealed important points be taken into consideration when deploying based control system. Besides, our results can hints by writers system developers efficient authorization services.