关系模式到模块化的XML Schema的模型映射方法

Algorithm to convert from relational schema into modularized XML schema

基于关系模式的向量模型和XML模式树模型,提出了一种关系模式到模块化的XML Schema的模型映射方法BTT,其映射规则保持了关系模式的结构、属性以及约束信息的完整保留,自底向上的映射顺序在没有牺牲转换效率的情况下,完成了模块化的封装与重用,使得对转换后的XML Schema文档的更新操作可以在模块化内部完成,大大提高了维护效率。实验结果表明了与传统的嵌套层次的XML Schema文档相比,BTT方法转换形成的XML Schema在维护效率上有明显优势。

Based on relational schema vector model and XML schema tree model,an algorithm BTT to convert from relational schema to XML schema is proposed.BTT mapping, rules preserve the integrity information of structure,properties and constraint.The conversion sequence from bottom to top confirms the modules encapsulated and reused, makes the update to XML schema can be finished in related module, greatly enhances the ma＇mtenanee efficiency.The experimental results show that compared to the traditional nested XML schema, the XML schema converted by BTT has obvious advantage in the maintenance efficiency.