MLSSP proposes a hierarchic access control scheme that has entrance and exit security policies and uses matrix-based and label-based access control model wholly.

• 为此本文在位置信息的层次域模型基础上构造了一种层次性的访问控制机制,它从访问的入口和出口两个方面综合考虑,综合使用了基于矩阵的和基于标号的访问控制模型。