xml形式的文件现在应用越来越越广泛，很多人甚至用xml来代替一部分数据库的应用，这个文档简单的介绍了xml的应用，是入门的好帮手-xml form of documents are now more and more widespread application, many people even used to replace part of the xml database applications, this document describes a simple application of xml is a good entry-helper