摘要： 提出了一种基于GML的中介方法来实现空间信息查询和集成。实现时包括了包装和中介两个过程。中介的功能是将查询分成若干个子查询发送到相应的包装器中，对各个子查询所返回的结果进行集成，并将集成后的结果以SVG的格式返回给最终用户，而包装则将子查询发送到相应的数据源中，以及将从数据源返回的空间数据进行GML格式的转换。

关键词: 地理标注语言, 中介, WebGIS, 空间数据集成

Abstract: This paper proposes an approach of GML-based mediation to solve this heterogeneous problem. It includes two parts: wrapper and mediation. The functions of mediation are as follows: decompose the query to some sub-queries; send them to appropriated wrapper; and integrate the results, which are returned by wrapper; transform GML into SVG format. The functions of wrapper are as follows: translate the sub-query into local query and send them to the appropriate source; transform the spatial data into GML format.

中图分类号: 

• TP399