格式良好的XML需满足五个基本规则：1. 有且仅有一个根元素，所有其他元素必须嵌套其内；2. 所有标签必须成对出现或自闭合，不可缺失结束；3. 标签名称区分大小写且命名合法，不能以数字或xml开头；4. 属性值必须用引号括起，单双引号均可但不可省略；5. 元素必须正确嵌套，禁止交叉闭合。遵守这些规则可确保XML被解析器正确读取。
格式良好的XML（Well-Formed XML）是
指符合XML语法规范的文档。它不涉及数据含义或结构是否正确，只关注语法是否正确。一个XML文档如果不符合“格式良好”的规则，解析器将无法读取，程序会直接报错。对于新手来说，掌握以下5个基本构成规则是理解和编写XML的基础。
1. 有且仅有一个根元素
每个格式良好的XML文档必须包含一个唯一的根元素，所有其他元素都嵌套在这个根元素之内。
说明：- 根元素是整个XML结构的起点。
- 不能有多个并列的顶级元素。
错误示例：Java入门 Web开发
Java入门 Web开发
2. 所有标签必须成对出现（或自闭合）
每一个开始标签必须有对应的结束标签，或者使用自闭合语法表示空元素。
说明：- 标签不能缺失闭合部分。
- 空元素可用
错误示例：XML基础
XML基础</pre> <h3>3. 标签名称区分大小写且命名合法</h3> <p>XML标签对大小写敏感，且命名需遵循特定规则。</p> <font>说明：</font> <ul> <li> <code><book></book></code> 和 <code><book></book></code> 被视为不同标签。</li> <li>标签名不能以数字或xml（不区分大小写）开头。</li> <li>只能包含字母、数字、连字符、下划线等合法字符。</li> </ul> <strong>正确示例：</strong> <pre class="brush:php;toolbar:false;"><user-name>Alice</user-name></pre> <strong>错误示例：</strong> <pre class="brush:php;toolbar:false;"><1user>Bob</1user> <xmlData>...</xmlData></pre> <h3>4. 属性值必须用引号括起来</h3> <p>所有属性的值必须使用单引号或双引号包围，不能省略。</p> <font>说明：</font> <ul> <li>双引号最常用，若值中包含双引号，可用单引号包裹。</li> <li>无引号的属性会导致解析失败。</li> </ul> <strong>正确示例：</strong> <pre class="brush:php;toolbar:false;"><person name="张三" age="25" /> <note author='李四' type="提醒" /></pre> <strong>错误示例：</strong> <pre class="brush:php;toolbar:false;"><person name=张三></person></pre> <h3>5. 元素必须正确嵌套</h3> <p>XML元素不能交叉嵌套，必须一层层完整闭合。</p> <font>说明：</font> <ul> <li>先打开的标签必须后关闭。</li> <li>不能出现“开门不关门”或“关门没门”的情况。</li> </ul> <strong>正确示例：</strong> <pre class="brush:php;toolbar:false;"><b><i>斜体加粗文本</i></b></pre> <strong>错误示例：</strong> <pre class="brush:php;toolbar:false;"><b><i>斜体加粗文本</b></i></pre> <p>基本上就这些。只要遵守这5条规则，你写出的XML就能被大多数解析器顺利读取。虽然简单，但每一条都可能成为初学者的“坑”。多写多练，养成规范习惯，XML就会变得清晰易用。</p> <!-- 相关栏目开始 --> <div class="xglm" style="display:none;height:0;overflow: hidden;font-size: 0;"> <p><br>相关栏目： 【<a href='/news/' class=''> 最新资讯 </a>】 【<a href='/seo/' class=''> 网络优化 </a>】 【<a href='/idc/' class=''> 主机评测 </a>】 【<a href='/wz/' class=''> 网站百科 </a>】 【<a href='/jsjc/' class='on'> 技术教程 </a>】 【<a href='/wen/' class=''> 文学范文 </a>】 【<a href='/city/' class=''> 分站 </a>】 【<a href='/hao/' class=''> 网址导航 </a>】 【<a href='/guanyuwomen/' class=''> 关于我们 </a>】 </p> </div> <!-- 相关栏目结束 --> <div class="widget-tags"> <a href="/tags/315.html" class='tag tag-pill color1'>go</a> <a href="/tags/346.html" class='tag tag-pill color2'>多个</a> <a href="/tags/729.html" class='tag tag-pill color3'>在这个</a> <a href="/tags/1375.html" class='tag tag-pill color4'>就能</a> <a 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