空间查询语言规范GML-QL的研究  

Research on the Specification of Spatial Query Language-GML-QL

作　　者：王飞[1] 

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州341000

出　　处：《国土资源信息化》2008年第4期31-35,共5页Land and Resources Informatization

基　　金：地理信息科学江苏省重点实验室开发基金项目:(编号:JK20050302);江西省教育厅科技研究项目:(编号:赣教技字[2006]195号)

摘　　要：广泛运用Web和分布式地理信息系统(WGIS/DGIS)有利于共享的空间数据库组织之间和用户通过互连网进行数据交换。不过,这些系统和应用软件的互操作性仍然是一个不能解决的问题,直到最近出版的地理标记语言(GML)标准的出现,这一问题才得到了解决。GML是一个新的实施规范并提供中立的框架为定义地理空间应用模式和对象的可扩展标记语言(XML)的文档。XML迅速成为一个事实上的标准电子数据交换之间的Web应用程序,然而,传统的数据库查询语言,在其目前的形式下并不适合直接查询和更新XML库。由W3C提出的XQuery查询语言为XML提供了强大的查询功能,但它缺乏支持空间查询,本文主要研究具有空间查询的语言GML-QL。The widespread use of Web and the distributed geographic have facilitated the data exchanges through the internet between the spatial database. However, the interoperability of these systems and problem. The recent publication of the Geographic Markup Language information systems （WGIS/DGIS） organizations and users sharing the applications has been an unsolved （GML） standard has solved this problem. GML is a new implementation specification that offers a vendor-neutral framework for the definition of geo-spatial application schemas and objects as Extensible Markup Language （XML） documents. XML is quickly becoming a de facto standard for electronic data exchanges among the Web applications and we expect the same trend with GML for WGIS applications. However, the conventional query languages in their current form are not suitable for direct query and update of XML repositories. The recent publication of Xquery standard by W3C offers a powerful standard query language for XML. But it cannot support the spatial query. This paper mainly studies the GML-QL, the language that has the function of spatial query.

关 键 词：XML查询语言 GML 空间查询语言 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]