mappedBy标签一定是定义在the owned side(被拥有方的)，并指向the owning side(拥有方)的。在本例中，Node类为关系目标方，即被控对象，the Owned 端；PageServer类为关系拥有方，即主控对象， the Owner 。
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The other side of that is owning up to your mistakes.
这样做的另外一方面是要承认自己的错误。
In particular, by owning the form, the viewer control is able to cache its state to the client side.
特别是我们拥有形式后，阅读器控制可以将状态信息缓冲到客户端。
In particular, by owning the form, the viewer control can cache its state to the client side.
特别是，通过控制form, viewer控制可以在客户端缓存状态。
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