随着多级安全数据库研究和实际应用的深入，对多级安全数据模型提出了新的要求。
With the progresses of research and application of Multilevel Secure database, new requirements of Multilevel Secure Models are presented.
尝试从一个新的角度——数据紧凑度对数据模型进行分析和比较，对于多级安全数据模型的改进和实现具有一定的指导意义。
In this paper, we attempt from a new view-Data Compact Ratio, to analyze and compare the data model, which is instructive for the improvement and realization of Multilevel Secure Data Model.
尝试从一个新的角度——数据紧凑度对数据模型进行分析和比较，对于多级安全数据模型的改进和实现具有一定的指导意义。
In this paper, we attempt from a new view-Data Compact Ratio, to analyze and compare the data model, which is instructive for the improvement and realization of Multilevel Secure Data Model.
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