原xml文件格式:
<a>
<grade>高一</grade>
<class>3班</class>
<student>
<id>001</id>
<name>张三</name>
</student>
<student>
<id>002</id>
<name>李四</name>
</student>
......#此处还有很多student标签,省略
</a>
解析成:
{grade:高一,class:3班,id:001,name:张三}
{grade:高一,class:3班,id:002,name:李四}
......