The mapping can be combined for a direct DTD to relation database schema.

映射过程也可合并为直接有DTD到关系数据库的映射。

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Then it analyzes the possibility of XML based data exchange from the aspects of schema binding of XML and relation database.

然后对从XML与关系数据库的模式映射进行了探讨，研究了主流关系数据库对XML的支持情况。

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