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| 一种基于模式匹配的超媒体查询模型 |
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周学海1, 李光亚2, 李曦1, 龚育昌1, 赵振西1
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1.中国科学技术大学,计算机科学与技术系,合肥,安徽,230027;2.上海万达信息股份有限公司,上海,200233
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| 摘要: |
| 在基于语义网络的超媒体模型基础上,通过引入数据库模式、模式约束图以及分层模式依赖图等概念,提出了一种基于模式匹配的超媒体查询模型,给出了图形代数的形式化定义,并证明了该模型的查询能力.该模型具有较高的表达能力,能有效地降低用户的认知负载. |
| 关键词: 超媒体系统 数据库模式 模式约束图 图形代数 关系完备性 |
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| 基金项目:国家自然科学基金资助项目(69503005);安徽省自然科学基金资助项目(99043302) |
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| A Hypermedia Retrieval Model Based on Pattern Matching |
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ZHOU Xue-hai,LI Guang-ya,LI Xi,GONG Yu-chang,ZHAO Zhen-xi
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| Abstract: |
| Built on the semantic network based hypermedia model, a hypermedia retrieval model based on pattern matching is proposed in this paper by introducing the concepts of database schema, model constraint graph and stratified schema dependency graph. Furthermore the formal definition of graph algebra is given out, which guaranteed the model抯 retrieval ability. On the one hand, this model can decrease the users?cognitive overhead. On the other hand, it guarantees the expressive capability of the retrieval. |
| Key words: hypermedia systems database schema model constraint graph graph algebra relational completeness |