通过标记树以及分层标记符的划分，提高了系统对于文档核心意义判定的能力。
Through the marked tree and the layering mark symbols, increase the system ability to judge the core meaning of the web page.
按项目时间、文档内容、文档文件类型等对工程文档信息进行分层，以PBS为标识系统，形成工程文档编码的目录集成结构模型。
This model, with PBS as sign system, delaminated according to time, information content and document type is a kind of project document code catalog integrated structure.
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