支持多种查询语言的演绎数据库系统

DEDUCTIVE DATABASE SYSTEM WITH MULTI-QUERY-LANGUAGE

介绍并讨论了当前演绎数据库的理论基础及实现方法，提出了一种基于松、紧耦合相结合的实现机制；讨论了自行研制的演绎数据库系统ＤＡＣ中知识表示的两级模式，简单介绍了ＤＡＣ的总体结构及其功能模块、两种演绎查询语言，并给出了一种基于有向图的递归查询算法．

The current status of Deductive Data Base System(DDBS) in modeling and approaches is discussed.Based on the integration of loose and tight coupling a mechanism of realizing DDBS is proposed.Then the deductive data base system is briefly introduced, and the design of multiquerylanguage and two-level knowledge representations are discussed as well. Finally,a graph-based recursive query processing algorithm is given.