This study shows that GML can express spatial data information and is very effective to share the spatial information.

研究表明，GML可以表达空间数据信息，并有利于实现空间数据共享。

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Firstly, this paper introduce GML and SVG, analyzed that how to express spatial data with GML and the advantages of using SVG to publish it on the web.

文中首先对GML和SVG技术进行了介绍，分析了GML怎样表示空间数据以及用s VG对其进行发布的优点。

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R-tree is a dynamic index tree of space search. Its structure use multi-dimensional region to express spatial data object. R-tree is a valid way to visit rectangle.

树是空间搜索的动态索引树，它的结构是利用多个维中的区间来表示空间数据对象，它是矩形访问的一种有效方法。

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