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In this paper,we propose a new relational schema (R-schema) to XML schema translation algorithm,VQT,which analyzes the value cardinality and user query patterns and extracts the implicit referential integrities by using the cardinality property of foreign key constraints between columns and the equi-join characteristic in user queries. The VQT algorithm can apply the extracted implied referential integrity relation information to the R-schema and create an XML schema as the final result. Therefore,the VQT algorithm prevents the R-schema from being incorrectly converted into the XML schema,and it richly and powerfully represents all the information in the R-schema by creating an XML schema as the translation result on behalf of the XML DTD.