This paper presents a description of an access control list (ACL) used to conduct role-based access control (RBAC), with particular emphasis on temporal constraints using extensible markup language (XML) and Web ontology language (OWL). It is natural to use OWL for describing ACL because OWL is based on set theory. Set theory is useful in this case because RBAC maps privileges naturally to users from the viewpoint of users' functions. Comparison of XML and OWL in terms of their use as an ACL is described. A teaching management model is used to illustrate examples of these implementations.
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