xml dom结构概念图解

                                       实例XML文档内容：

xml version="1.0" encoding="UTF-8"?>
<catalog xmlns="">
  <book id="bk101">
     <author>Matthewauthor>
     <title>XML Developertitle>
     <genre>Computergenre>
     <price>44.95price>
     <publish_date>2000-10-01publish_date>
     <description>After an inadvertant description>
  book>
  <book id="bk109">
     <author>Kress, Peterauthor>
     <title>Paradox Losttitle>
     <genre>Science Fictiongenre>
     <price>6.95price>
     <publish_date>2000-11-02publish_date>
     <description>James Salway discoversdescription>
  book>
catalog>

对应的概念术语：
 

对应的API接口(暂且这么称呼)：
<book id="bk109"> book> 就是 IXMLDOMNode
所有的<book> 就是  IXMLDOMNodeList author、title、price 这些则是 IXMLDOMElement  author、title、price 的值则是 IXMLDOMText