2David H. The Workflow Reference Model [R].Technical Report, WFMCT000-1003. Hampshire: 1995: 9-11.
3Holl ingsworth D. The Workflow Reference Model. WFMC-TC-1011. Brussels: 1999: 8-9.
4Joshi J B D, Bertino E, Latif U, etal. A 6eneralized TemporalRole-based Access Control Model. IEEE Transactions of Knowledge and Data Engineering, 2005, 17 (1): 4-23.
3Sandu R S,Coyne E J,Feinstein H L.Role based access control models[J].IEEE Computer,1996,29(2):38-47.
4Ferraiolo D F.Proposed NIST standard for role based access control[J].ACM Transactions on Information and Systems Security (TISSEC),2001,4(3):224 -274.