1、XML的作用
XML 被设计用来传输和存储数据。所以XML 是不作为的。
2、简单的描述
XML 文档形成一种树结构。
XML 文档必须包含 根元素。该元素是所有其他元素的父元素。XML 文档中的元素形成了一棵文档树。这棵树从根部开始，并扩展到树的最底端。所有元素均可拥有子元素：
<root> <child> <subchild>.....</subchild> </child> </root>
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父、子以及同胞等术语用于描述元素之间的关系。父元素拥有子元素。相同层级上的子元素成为同胞（兄弟或姐妹）。所有元素均可拥有文本内容和属性（类似 HTML 中）。
3、语法规则
所有 XML 元素都须有关闭标签
XML 标签对大小写敏感
XML 必须正确地嵌套
XML 文档必须有根元素
XML 的属性值须加引号
实体引用
| < | < | 小于 |
| > | > | 大于 |
| & | & | 和号 |
| ' | ' | 单引号 |
| " | " | 引号 |
XML 中的注释
在 XML 中编写注释的语法与 HTML 的语法很相似：
<!-- This is a comment -->
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在 XML 中，空格会被保留
在 XML 中，文档中的空格不会被删节。
XML 以 LF 存储换行
在 Windows 应用程序中，换行通常以一对字符来存储：回车符 (CR) 和换行符 (LF)。这对字符与打字机设置新行的动作有相似之处。在 Unix 应用程序中，新行以 LF 字符存储。而 Macintosh 应用程序使用 CR 来存储新行。
4、实例
上图表示下面的 XML 中的一本书：
1 <bookstore> 2 <book category="COOKING"> 3 <title lang="en">Everyday Italian</title> 4 <author>Giada De Laurentiis</author> 5 <year>2005</year> 6 <price>30.00</price> 7 </book> 8 <book category="CHILDREN"> 9 <title lang="en">Harry Potter</title> 10 <author>J K. Rowling</author> 11 <year>2005</year> 12 <price>29.99</price> 13 </book>14 <book category="WEB">15 <title lang="en">Learning XML</title> 16 <author>Erik T. Ray</author> 17 <year>2003</year> 18 <price>39.95</price> 19 </book>20 </bookstore>
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例子中的根元素是 。文档中的所有 元素都被包含在 中。
元素有 4 个子元素：、< author>、<year>、<price>。</p> <p> </p> <p>总结：1、这种可扩展的标记语言主要用来<strong>用来传输和存储数据</strong>，XML自己不作为，只有使用程序语言或者XML工具才能传送、接收和显示出这个文档。</p> <p> 2、语法规则：根元素，标签成对嵌套出现，区分大小写，属性必须加引号，5中特殊字符的实体引用，空格会被呈现</p> <p> 3、节点和元素的关系留在下一篇中讲解</p> <p class="sycode"></p> <p class="sycode"></p> <p class="sycode"> </p>
<p class="sycode"> </p> <p class="sycode"></p> <p class="sycode"></p>
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