For example, the ID of a tag should be unique, and the value attribute of a tag should be bound to a piece of data in Page data view.
例如，标签的ID应该是独一无二的，而标签的值属性应该与Pagedata视图中的数据片段相联系。
If the portlet application is already installed, the action attribute with a value of "create" might fail, since the globalid attribute should be unique.
如果已经安装了portlet应用程序，那么值为“create”的action属性可能会失败，因为globalid属性应该是唯一的。
To specify further that the unique key attribute (marked with @Id annotation) will rely on your database to generate its value.
进一步地指定独一的主键值（标为 @Id注释），取决于生成值的数据库。
Click on the second message component and set it up like the one above. However this time the Id attribute should be set to a unique value such as message2.
在第二个消息组件上单击，并且像上面那样设定。
Click on the second message component and set it up like the one above. However this time the Id attribute should be set to a unique value such as message2.
在第二个消息组件上单击，并且像上面那样设定。
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