Deep Web查询界面中的模式代数及其应用

Schema Algebra in Integration of Deep Web Database Query Interface and Its Applications

集成Web数据库的第一个挑战就是集成它们的查询界面。从类比于关系代数的角度来看,每一个界面都等价于一组基于L-树的模式。为集成这些模式获得全局模式,详细研究模式的定义和运算——模式代数,通过对其进行应用实践,表明模式代数能较好地应用于异构相关Web查询主题的集成。

The first big challenge to integrate Web Databases is to integrate their query interfaces. From the view of database, every interface equals a schema. In order to integrate these schemas, establishes a L-tree model called schema, and gives the definition and operations of schema, which we called schema algebra. Our application with schema algebra manifested that it can be well apply with interface integration of Web database with same or relative themes.