The extensions file will refer back to elements inside the 这个扩展文件将向后引用
2.
Tags to create hyperlinks and forms to refer back to the calling portlet 标签来创建超链接和表单，以便向后引用正在调用的portlet 。
3.
Are used to dynamically display the current counter value and create a form action to refer back to the calling portlet 用于动态显示计数器值，创建一个表单动作，以便向后引用正在调用的portlet 。
