很多SOA实现在架构的几个层级都要求技术专家：业务流程、业务规则、数据服务、安全等。
Many SOA implementations require technology expertise in several layers of the architecture: business processes, business rules, data services, security, etc.
描述适用于使用者原则层级的安全常规。
Describes security practices that apply to the user policy level.
在载入时间，程序码存取安全系统会检查所有原则层级，产生的使用权限授权是每一个层级中所有允许的使用权限的交集。
At load time, the code access security system examines all policy levels and the resulting permission grant is the intersection of all allowed permissions in each level.
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