能否给出一个最简单的例子程序，来说明一个xml文件，同时用了dtd和schema来定义数据格式? 有最简单的代码最好。谢谢！！！！！

I don't know much XML yet, but I was thinking about how the file format is sort of coded in the dtd file. If your .dtd is copyrighted and you don't share, isn't that sort of preventing people from ...