基于地理标识语言的空间数据查询模式与实现

提出了基于地理标识语言（GML）的地籍和房产空间对象模型，并以此探讨了基于可扩展标识语言（XML）的地籍空间对象及其关系的查询模式，给出了基于XQuery的查询实现方法．开发了一个采用JAVA、文档对象模型（DOM）、简单应用程序接口（SAX）和XQuery的空间数据管理应用平台，验证了本文提出的基于GML的空间对象模型和基于XQuery实现查询XML地籍空间数据与空间关系的可行性．

GML Based Spatial Object Query Model and XQuery Based Implementation in GIS

The cadastral spatial object query model based on geographic markup language(GML) and its implementation based on XQuery were proposed.Cadastral spatial feature model based on GML is first defined.An XML schema describing GML structure is then put forward.The query models for cadastral spatial objects and topological relationships between them are further presented,and query methods are described based on XQuery technology,including querying the relationships between point and point objects,point and line objects,point and area objects,line and area objects,and area and area objects in cadastral spatial features.Based on this,XML based documents are then created to store the cadastral spatial data.And the proposed spatial models based on GML and the query technologies based on XQuery are tested through a system that is developed based on Java,DOM and SAX.The results show that it is feasible to implement XQuery to query the relationships between cadastral spatial objects based on GML.