mybatis中的配置文件的约束

一个是全局配置文件（Config.xml）的约束

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

一个是Mapper.xml的约束

1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE mapper  
3   PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"  
4   "http://mybatis.org/dtd/mybatis-3-mapper.dtd">