经典索引方法，它是在R树的基础上进行改进，再次提高了查询速度，用VC编写，代码精炼。-Classic index method, which is in the R-tree based on the improved query speed once again increased, with VC development, refining the code.

里面详细的介绍了R树的结构，详尽的描述了一个R树类-Which describes in detail the structure of R tree, detailed descr iption of an R category tree