dependency theory
3.First of all, carry on the contrast to the existing semantic analytical method , find out the pluses and minuses of each theory, especially, introduce the Case grammar and the conceptual dependency theory , synthesize but two advantages regard as theoretical foundation .
5.Ma Jianzhong established“grammatical theory on two levels”in 1898.“The Philosophy of Grammar”by Otto Jesperson is neo-traditional grammar of Europe，and his theory of three ranks is the origin of the dependency relation grammar.
6.In this paper,based on rough set theory and relational database,the relationship between rough relational database and fuzzy relational database is analyzed systematically from functional dependency,normal form and Armstrong axiom.
