We propose a new approach to store and query XML data in an RDBMS basing on the idea of the numbering scheme and inverted list. O ur approach allows us to quickly determine the precedence, sibling and ancestor/ desc...We propose a new approach to store and query XML data in an RDBMS basing on the idea of the numbering scheme and inverted list. O ur approach allows us to quickly determine the precedence, sibling and ancestor/ descendant relationships between any pair of nodes in the hierarchy of XML, and utilize path index to speed up calculating of path expressions. Examples have de monstrated that our approach can effectively and efficiently support both XQuery queries and keyword searches. Our approach is also flexible enough to support X ML documents both with Schema and without Schema, and applications both retrieva l and update. We also present the architecture of middleware for application acc essing XML documents stored in relations, and an algorithm translating a given X ML document into relations effectively.展开更多
本文根据 W3C最新提出的 XML Schema规范,提出了一种等价于 XML Schema的数据模型S-Schema,并实现了S-Schema到关系模式的生成算法和XML文档到关系数据库的加载算法。实验证明,S-Schema方法在数据转储过程中的信息保持、映射后的查询更...本文根据 W3C最新提出的 XML Schema规范,提出了一种等价于 XML Schema的数据模型S-Schema,并实现了S-Schema到关系模式的生成算法和XML文档到关系数据库的加载算法。实验证明,S-Schema方法在数据转储过程中的信息保持、映射后的查询更新操作等方面的综合性能要优于文本、Xparent方法。展开更多
文摘We propose a new approach to store and query XML data in an RDBMS basing on the idea of the numbering scheme and inverted list. O ur approach allows us to quickly determine the precedence, sibling and ancestor/ descendant relationships between any pair of nodes in the hierarchy of XML, and utilize path index to speed up calculating of path expressions. Examples have de monstrated that our approach can effectively and efficiently support both XQuery queries and keyword searches. Our approach is also flexible enough to support X ML documents both with Schema and without Schema, and applications both retrieva l and update. We also present the architecture of middleware for application acc essing XML documents stored in relations, and an algorithm translating a given X ML document into relations effectively.
文摘本文根据 W3C最新提出的 XML Schema规范,提出了一种等价于 XML Schema的数据模型S-Schema,并实现了S-Schema到关系模式的生成算法和XML文档到关系数据库的加载算法。实验证明,S-Schema方法在数据转储过程中的信息保持、映射后的查询更新操作等方面的综合性能要优于文本、Xparent方法。
