一种用来在两个使用地址的文件将进行关联的机制。地理坐标和属性可以从一个地址转换成另一个。举例来说,一个学生包含地址的文件可以映射到一个街道图层上,该图层包含了学生居住点的点图层的地址。-used in a two addresses the use of the documents will be linked to the mechanism. Geographical coordinates and attributes can be converted into one another address. For example, a student's paper contains addresses can be mapped to a street layer, the layer contains the student residence address point layer.