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Access control is one of the most fundamental and widely used security mechanisms. Access control mechanisms control which principals such as users or processes have access to which resources in a system. To facilitate managing and maintaining access control, access control policies are increasingly written in specification languages such as XACML. The specification of access control policies itself is often a challenging problem. Furthermore, XACML is intentionally designed to be generic: itdoi:10.1109/compsac.2007.96 dblp:conf/compsac/HuMHX07 fatcat:jzoj2m74x5bz3nc6qjklukoq5u