一种基于扩展时态XML模型的索引技术

时间是信息的重要属性。随着数据库技术的迅速发展,时态信息的应用已渗透进各行各业中。将时态引入XML中,具有现实和必要的意义,对XPath模型进行了适当的修改,基于扩展后的模型,定义了一种时间连通性的等价关系,并且在该关系的等价类的基础上建立索引,以实现对时态XML文档查询的优化。

An index technology based on modified the temporal XML mode

With the fast development of database technique, the application of temporal information is coming into every field. Andbecause the XML document is seldom static and be modified frequently, it is necessary and meaningful to add the temporal informa-tion to XML. In this paper, some modification works on the XPath model are introduced firstly. Further more, an indexing techniquebased on the modified model is represented. In temporal XML document with that index, a time-connectivity relationship is defined,and an index based on the equivalence relationship is created.