XML（可扩展标记语言）是一种用于存储和传输数据的标记语言，其文件格式具有以下特点：
一、基本定义
标记语言属性
XML是标准通用标记语言（SGML）的子集，通过自定义标签描述数据结构，具有自我描述性。例如：
```xml
Java编程基础 张三
2020
```
标签如``、``等需用户自行定义，以适应特定数据需求。</p><p><strong>纯文本格式</strong> </p><p> XML文件本质上是纯文本文件，使用字符编码（如UTF-8）存储，可被任何文本编辑器打开。其结构通过标签嵌套实现，例如：<p> ```xml<p> <?xml version="1.0" encoding="UTF-8"?><p> <note><p> <to>李四</to><p> <from>王五</from><p> <heading>会议通知</heading><p> <body>请于3月10日上午9点开会
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