information object

For extracting information from list, wrapper can automatic get the path, which the information block is in layer structure of DOM by analysing structure of DOM, and get the value of information object base on extraction knowledge.

对列表结构信息源信息，通过对DOM树结构的分析，动态获得信息块在DOM层次结构中的路径，根据信息对象基本的抽取知识，获得信息对象值。

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According to the new concept, error in information system is inevitable. In order to control the information object error and structure error, information system has been compared with the communication system.

为了深入理解信息系统的误差和控制信息系统结构、内容的误差，对信息系统与通信系统进行了类比，得到了信息系统与通信系统的对应关系。

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In the system, dates can convenient read and modify through establishing and sharing database module for different information object.

在系统中，通过建立不同信息对象的数据库模块，并进行关联和共享，实现数据方便快捷的读取和修改。

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