【摘要】 当前,在各研究组织提出的策略信息模型中,策略条件都可以是由逻辑运算符“OR”或者“AND”联结的表达式。策略条件中的“OR”运算和“AND”运算给策略的表示带来了很大的方便性和灵活性。但是,策略条件中的“OR”运算可能会导致网管系统中产生三种类型的问题。文章研究了各研究组织提出的策略信息模型,指出了策略信息模型中策略条件“OR”运算可能导致的三类问题,并提出了解决此三类问题的方法。更多还原

【Abstract】 Nowadays,policy condition can be expressed as ORed sets of statements or ANDed sets of statements in policy information models proposed by different research organizations.ORed or ANDed sets of condition statements provide convenience and flexibility to express policies,but three kinds of problems may arise due to ORed sets of condition statements.Different policy information models are studied and three kinds of problems caused by ORed sets of condition statements are pointed out in this paper.The methods to resolve these problems are proposed.更多还原