基于时空推理和XML的时空查询语言

Spatio-temporal Query Language Based on Spatio-temporal Reasoning and XML

新一代地理信息系统(简称GIS)正在向同时处理时间和空间信息发展,时空查询成为GIS的研究重点。目前的时空查询语言不论在语法还是语义方面都存在不足。为此,设计了一个基于XML的扩展SQL时空查询语言ST XSQL,并在组件地理信息系统CGIS上实现。鉴于XML是当前各类基于Web的查询语言普遍采用的技术手段,ST XSQL采用基于XML的扩展SQL语法。语义解释采用时空推理中著名的RCC和区间代数理论。与同类工作相比,ST XSQL的语法表达更加清晰和严谨,时空关系语义也更加完备和实用。

New Geographical Information Systems(GIS) are developing towards the aim of processing spatial and temporal information together. So spatio-temporal query is becoming more and more important. But the researches of it cannot satisfy in neither syntax nor semantic aspect. To deal with this, a spatio-temporal query language based on Spatio-temporal Reasoning and XML (ST-XSQL) is put forward, and implemented in CGIS. In syntax aspect, ST-XSQL is based on XML which is the main method of Web based system. RCC and interval algebra in Spatio-temporal Reasoning serves as semantic. Compared with similar work, ST-XSQL is more clear and precise in syntax and more powerful and practical in semantic.