传统手工编制叙词表的方法已不再适用于网络环境。
Traditional manual thesaurus compilation methods are no longer suitable to the networked environment.
手动跟踪的网络清查仅适用于最小的环境。
Manually keeping track of network inventory only works for the smallest environments.
对角色的授权约束加入空间特性，使之能够形式化描述多个层面的空间职责分离约束，从而适用于无线网络的应用环境。
This paper also extends a role-based authorization constraint model to describe constraints with spatial character on different levels, which is suited for wireless network.
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