如果该节点不是空的，是不能被删除的。

If that nodes are not empty, there is no deletion.

youdao

例如，如果该节点集在布尔型上下文中使用，唯一需要的处理就是测试它是否是空的。

For example if the node-set is used in a Boolean context, the only processing needed is to test whether it is empty.

youdao

如果该节点描述的设备有一个地址的话就还应该加上设备地址（unit-address）。

The unit-address is included if the node describes a device with an address.

youdao