This paper proposes an algorithm that is used to construct the Web structure tree and a Web information extraction method based on Web page structure tree.
结合树型结构和网络结构的自身优势与缺陷，提出了城市绿地树网型结构模式，并对城市绿地树网结构的特征、优势和研究方向提出了建议。
It can also be thought of as parsing out chunks of information from a page. Web pages are coded in HTML, which uses a tree-like structure to represent the information.
页面抓取本质上是HTML页面的反向工程，也可以看成页面解释器，网页以HTML编码，HTML以树型结构表示信息，实际数据与布局代码以及效果信息混杂在一起，不能被计算机直接利用。
Based on the analysis of information extraction process and the structure of product web page, a product information extraction model based on DOM tree is established.
在分析信息抽取过程和商品网页结构的基础上，构建了基于网页DOM树的商品供应信息抽取模型。
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