No type is associated with the object, so you can modify this structure freely.
每个对象并不与类型相关，所以可以自由地修改这种结构。
2
While some programs look up and modify the values contained in XML documents, others modify the structure of the document itself by adding and removing nodes.
一些程序查询和修改XML文档中包含的值，而其它程序则通过添加和除去节点来修改文档本身的结构。
3
If you choose to use a different directory structure, make sure you modify these directory names appropriately.