Given attribute set and minimum cover set of functional dependencies over one relational schema, a new method for designing normalized XML schemas based on schema graph is proposed.

在给定关系模式的属性集及其函数依赖最小覆盖集的基础上，提出一种基于模式图的规范化XML模式设计方法。

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Finally the approximation algorithm for the minimum weak vertex cover set is analyzed based on the maximal flow partition.

进一步分析了求解基于最大流划分的最小弱顶点覆盖集的近似算法。

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Meanwhile, several relational concepts are defined, and the full and necessary condition under which the standard FDs set becomes a minimum cover, and other problems are discussed.

同时，还定义了与它相关的几个概念，讨论了标准FD集f成为最小覆盖的充要条件及其它问题。

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