随着GIS应用的扩大，多用户并发操作成为空间数据引擎的基本要求。
With the expanding of GIS application, multi-user concurrent operation becomes the basic demand for spatial data engine.
空间数据引擎是实现空间数据库的核心，能有效存储和管理空间数据。
Being the kernel of spatial database, spatial database engine is capable of managing and maintaining spatial data efficiently.
为使对象关系数据库更方便存储和查询空间数据，空间数据访问引擎的设计是关键。
The design of spatial data accessing engine is the key for object RDMBS to memory and query spatial data.
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