Table 2.

Dynamic conditions and contextual entities.

Research	Context Definition	Entity
Dey et al. [60]	The context information can be seen as any information that can be used to characterize the situation of an entity (an entity is a person, a place or an object).	Person, Place and Object
Kayes et al. [62]	The context information can be seen as any information that can be used to characterize the state of the relevant access control-specific entities and the state of the relevant relationships between different entities (an access control-specific entity is a user, a resource or an environment).	User, Resource and Environment