关键词: XML schema, 嵌套关系, 映射规则, 关系模式, 语义约束

Abstract: This paper built a set of structure mapping rules and semantic mapping rules according to the definition of elements and the nested relation between elements in XML schema. A new mapping method based on these mapping rules was proposed to transform XML Schema to relational schemata. Furthermore, the relational schemata mapped from XML Schema were proved in 4NF. The results indicate that the relational schemata not only contain all the information of structure and content in XML Schema, but also preserve most of the semantic constraints and reduce storage redundancy.

Key words: XML schema, nested relation, mapping rule, relational schema, semantic constraint