摘要： 针对现有工作流程管理系统在安全性与灵活性上的不足，提出一个基于任务的细粒度委托模型，该模型中的委托具有临时性、单步性、单调性、协议性及对称性等特征，规范了委托关系、委托条件、委托时效以及委托实施到撤消的整个委托生命过程。结果表明，该模型解决了由于执行人无法及时执行任务而引起的工作流程阻塞的问题，能提高系统的工作效率。

关键词: 工作流程, 访问控制, 角色, 任务委托

Abstract: For the deficiency of flexibility and security in today’s workflow management system, this paper proposes a task delegation model, which is characterized by temporariness, single-step, monotonicity, agreement, symmetry, etc. It specifies the delegation relationship, delegation condition, delegation prescription as well as the whole delegation process from implement ation to revoking. Therefore, the blocking problem in workflows caused by executor’s being unable to implement his/her tasks in time can be solved and the efficiency of the whole system can be greatly improved.

Key words: workflow, access control, role, task delegation

中图分类号: 

• N945.12