NDLI: Towards declarative XML querying

Content Provider	IEEE Xplore Digital Library
Author	Mengchi Liu Tok Wang Ling
Copyright Year	2002
Description	Author affiliation: Sch. of Comput. Sci., Carleton Univ., Ottawa, Ont., Canada (Mengchi Liu)
Abstract	Extracting data from XML documents is an important issue for XML research and development. However, how XML documents are viewed determines how they can be queried. We first describe a natural way of viewing XML documents as in complex object data models so that we can easily comprehend XML data from a database point of view. We then illustrate how to use logical variables to extract data from XML documents. We also describe a rule-based declarative query language for XML. We demonstrate that our rule-based language provides a uniform framework that has the following advantages over other XML query languages including XQuery. First, it provides a natural way of separating querying and result constructing using the body and head respectively. Second, several rules can be used for the same query so that complex queries can be expressed in a simple and natural way. Also, its use of logical variables and rules makes many functions and operators in XQuery and XPath unnecessary or definable constructively. Finally, it provides natural and direct support for recursion as in deductive databases and has logical foundations that have played a significant role in database research in the past.
Sponsorship	Software AG
Starting Page	127
Ending Page	136
File Size	307954
Page Count	10
File Format	PDF
ISBN	0769517668
DOI	10.1109/WISE.2002.1181650
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-12-14
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	XML Database languages Data mining Data models Research and development Deductive databases Computer science Web sites Navigation Relational databases
Content Type	Text
Resource Type	Article

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