config.dtd

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

mapper.dtd

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