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頁籤選單縮合
| 題 名 | A Pattern-Based Approach to Structural Queries on the World Wide Web=以樣本為基礎之結構化查詢 |
|---|---|
| 作 者 | 洪炯宗; 戴永裕; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
| 卷 期 | 24:1 2000.01[民89.01] |
| 頁 次 | 頁31-43 |
| 分類號 | 312.49 |
| 關鍵詞 | 結構化查詢; 物件導向資料庫; Hypertext systems; Structural query; Object-oriented database; Query processing; Association algebra; |
| 語 文 | 英文(English) |
| 英文摘要 | 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. |
本系統中英文摘要資訊取自各篇刊載內容。