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><div class="aritcle_card flexRow"> <div class="artcardd flexRow"> <a class="aritcle_card_img" href="/ai/1767" title="LALALAND"><img src="https://img.php.cn/upload/ai_manual/000/000/000/175680353532294.png" alt="LALALAND"></a> <div class="aritcle_card_info flexColumn"> <a href="/ai/1767" title="LALALAND">LALALAND</a> <p>AI驱动的时尚服装设计平台</p> </div> <a href="/ai/1767" title="LALALAND" class="aritcle_card_btn flexRow flexcenter"><b></b><span>下载</span> </a> </div> </div> <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> 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