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The EXtensible Access Control Markup Language (XACML) is a standard that defines a declarative access control policy language implemented in XML and a processing model describing how to evaluate access requests according to the rules defined in the policies.
As a published standard specification, one of the goals of XACML is to promote common terminology and interoperability between access control implementations by multiple vendors. XACML is primarily an Attribute-Based Access Control system (ABAC), where attributes (bits of data) associated with a user or action or resource are inputs into the decision of whether a given user may access a given resource in a particular way. Role-based access control (RBAC) can also be implemented in XACML as a specialization of ABAC.
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