| 从DTD映射到关系模式:一种保持数据依赖的映射方法 |
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| 引用本文： | 何盈捷,王珊.从DTD映射到关系模式:一种保持数据依赖的映射方法[J].计算机研究与发展,2004,41(5):868-873. |
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| 作者姓名： | 何盈捷 王珊 |
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| 作者单位： | 中国人民大学信息学院,北京,100872 |
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| 基金项目： | 国家自然科学基金项目 ( 60 2 73 0 17)，“九七三”国家重点基础研究发展规划基金项目( 2 0 0 1CCA0 3 0 0 0)，北京市科技计划重大基金项目(H0 3 0 13 0 0 40 0 11) |
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| 摘 要： | XML正迅速成为互联网上数据表示和交换的标准．用关系数据库存储XML数据是XML存储策略之一．为了将XML数据存储到关系数据库中，人们研究了从DTD到关系模式的映射方法．提出了一种保持数据依赖的映射方法PDD．与已有的Shared—Inlining方法相比，PDD方法充分考虑了DTD蕴涵的数据依赖关系，保证了XML文档的完整性．通过对泛关系进行模式分解，得到的关系模式保持函数依赖，并且满足2NF．可以证明，这种方法是有效的．
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| 关 键 词： | XML DTD 关系数据库 函数依赖 模式分解 |
Mapping DTD to Relational Schema:An Approach to Preserving Data Dependency |
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| HE Ying,Jie and WANG Shan.Mapping DTD to Relational Schema:An Approach to Preserving Data Dependency[J].Journal of Computer Research and Development,2004,41(5):868-873. |
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| Authors: | HE Ying Jie and WANG Shan |
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| Abstract: | XML is fast emerging as the standard for representing data in World Wide Web There are many strategies for storing XML documents and using relational database to storage XML is one kind of these strategies In order to store the XML data in relational database, mapping DTD to relational schema is studied An approach to preserving data dependency (PDD) is presented Compared with the shared inlining method, PDD takes full advantage of the data dependencies that are implied in DTD, and guarantees the integrity of XML documents It is based on schema decomposition The resulting relational schemas keep all functional dependencies and satisfy 2NF It is proved to be efficient |
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| Keywords: | XML DTD relational database functional dependency schema decomposition |
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