Access control is a is way of limiting access to a system or to physical or virtual resources. In computing, access control is a process by which users are granted access and certain privileges to systems, resources or information. In good old day older access control systems, users must present credentials before they can be granted access. In current physical systems, these credentials may come in many forms, but these credentials that can't cannot be transferred in order to provide a heavy security.
Entitlement management is the process granting privalages privileges to resources or usesusers, after fine-grain grained authentication for controling controlling access of users. XACML is an OASIS standard that describes both a policy language and an access control decision request/response language (both written in XML).
Therefore, The following topics will discuss how Entitlement Management and XACML useful can be used in access control.