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Note: The following is an excerpt from the official IETF RFC. It is provided here as a convenience and is not authoritative. Refer to the original document as the authoritative reference.

The eXtensible Access Control Markup Language (XACML) [XACML-3] defines an architecture and a language for access control (authorization). The language consists of requests, responses, and policies. Clients send a request to a server to query whether a given action should be allowed. The server evaluates the request against the available policies and returns a response. The policies implement the organization's access control requirements.