| GQL： Extending XQuery to Query GML Documents |
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| 作者姓名： | GUAN Jihong ZHU Fubao ZHOU Jiaogen NIU Liping |
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| 作者单位： | School of Computer, Wuhan University, 129 Luoyu Road, Wuhan 430079, China |
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| 基金项目： | Funded by the Youth Chengguang Project of Science and Technology of Wuhan City of China(No.20045006071-16) |
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| 摘 要： | IntroductionThe geography markup language (GML)1]is anXML encoding in compliance with ISO 19118 forthe transport and storage of geographic informationmodel according to the conceptual modeling frame-work used in the ISO 19100 series and includingboth the…
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| 关 键 词： | 空间特征 数据处理 地理信息系统 GML |
| 文章编号： | 1009-5020（2006）02-118-09 |
| 收稿时间： | 2005-12-12 |
GQL: Extending Xquery to query GML documents |
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| GUAN Jihong ZHU Fubao ZHOU Jiaogen NIU Liping.GQL: Extending Xquery to query GML documents[J].Geo-Spatial Information Science,2006,9(2):118-126. |
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| Authors: | Guan Jihong Ph D |
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| Institution: | GUAN Jihong ZHU Fubao ZHOU Jiaogen NIU Liping |
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| Abstract: | GML is becoming the de facto standard for electronic data exchange among the applications of Web and distributed geographic information systems. However, the conventional query languages (e.g. SQL and its extended versions) are not suitable for direct querying and updating of GML documents. Even the effective approaches working well with XML could not guarantee good results when applied to GML documents. Although XQuery is a powerful standard query language for XML, it is not proposed for querying spatial features, which constitute the most important components in GML documents. We propose GQL, a query language specification to support spatial queries over GML documents by extending XQuery. The data model, algebra, and formal semantics as well as various spatial functions and operations of GQL are presented in detail. |
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| Keywords: | XML GML spatial feature query language XQuery |
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