A Service-Centric Approach to a Parameterized RBAC Service
  Significant research has been done in the area of Role Based Access Control [RBAC]. Within this research there has been a thread of work focusing on adding parameters to the role and permissions within RBAC. The primary benefit of parameter support in RBAC comes in the form of a significant increase in specificity in how permissions may be granted. This paper focuses on implementing a parameterized implementation based heavily upon existing standards. 
Jonathan K. Adams