Earticle

초록

영어

This paper introduces three core modules of query reformulation engine, mapping document, query reformulation module, and statement conversion module. Mapping document is an XML document that keeps the mapping information between local data source and related data sources; using mapping document, applications could find data sources that have mapping relationship with its local data source. The query reformulation module reformulates the query statements submitted by users to local data resource to query statements to all data sources that have mapping relationship with local data resource. The statement conversion module converts XPath statements to OQL statements that are supported by OGSA-DQP; through OGSA-EDAI in the bottom layer, the access result to the data sources could be obtained. When a user submits an XPath statement to OGSA-DQP, it calls the query reformulation module, which first checks the mapping document to find information of other data sources, then expands and reformulates this XPath statement into query statements that are suitable for the mapped data sources. Afterward, the statement conversion module converts the reformulated XPath statements into OQL statements and returns to OGSA-DQP, which then performs the query operation.

목차

Abstract
 1. Introduction
 2. Schema Mapping
  2.1. Establishment and Rules of Schema Mapping
  2.2. Schema Mapping Document
 3. Query Reformulation
 4. Statement Conversion
 5. Experiment and Related Analysis
  5.1. Data and Preparation of the Experiment
  5.2. Experiment Results
 6. Conclusions
 References

키워드

저자

• Xiyin Liu [ Hebei Normal University of Science & Technology, China College of Information Science and Engineering Yanshan University, China ]
• Lijun Cao [ Hebei Normal University of Science & Technology, China College of Information Science and Engineering Yanshan University, China ]
• Zhongping Zhang [ Hebei Normal University of Science & Technology, China College of Information Science and Engineering Yanshan University, China ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Database Theory and Application

• 간기

  격월간

• pISSN

  2005-4270

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605