Data in Internet is a half structural system, and it is difficult to deal with them. Fortunately, the web sever log files have a nice structure and it is very convenient for data mining.

• 尽管Internet是一个半结构化的系统，很难对它进行处理，但是Web服务器日志记录具有良好的结构，非常有利于数据挖掘的进行。