摘要
The World Wide Web (WWW), a hypertext based, distributed collection of documents connected by hypertext links, contains millions of documents, thereby necessitating the ability to control navigation. This study, presents a query language to restrict navigation on the WWW. Query-based access mechanisms represent a fundamental solution to navigation problem in hypertext applications. Queries with structural search capabilities allow users to retrieve collections of information from a hypertext network based on a specification of their structures. In this paper, we propose a pattern-based structural query language for the WWW. This study also defines a set of patterns and uses pattern expressions to specify structural conditions in a query. The proposed pattern-based structural query language integrates the pattern-based query formulation and select-from-where construct of the structural query language (SQL). In addition, schema mapping rules are proposed to map the nodes and links of a hypertext application into objects and associations of an object-oriented database. Objects and their associations in an object-oriented database are uniformly represented by association patterns. A pattern-based structural query in hypertext systems is then translated into A-algebra expressions for query processing.
| 原文 | ???core.languages.en_GB??? |
|---|---|
| 頁（從 - 到） | 31-43 |
| 頁數 | 13 |
| 期刊 | Proceedings of the National Science Council, Republic of China, Part A: Physical Science and Engineering |
| 卷 | 24 |
| 發行號 | 1 |
| 出版狀態 | 已出版 - 2000 |