摘要： 随着地理数据网络化程度的提高和GML空间数据的应用越来越广泛，如何从海量的GML空间数据中检索出符合特定条件的地理要素数据成为目前GML研究的焦点问题之一。该文根据OGC制定的过滤编码执行规程，应用规程中的谓词作为查询关键字，结合GML空间数据的特点，通过查询转译器和优化器实现了一种应用于GML空间数据查询的可行性方法。

关键词: 查询转译器, 查询优化器, 过滤编码

Abstract: Considering characters of GML spatial data, using the predications of OpenGIS® filter encoding implementation specification as query key words, transforming and optimizing the query expression by middleware, this paper presents an accessible method to implement query for GML spatial data according to filter encoding proposed by OGC. The objective is to provide one way that can help to achieve the query given data from massive GML spatial data, which is the focus of GML research along with geographic data transferring through Internet and GML spatial data application increasingly.

Key words: query transformation, query optimization, filter encoding

中图分类号: 

• TP391