The delete trigger needs no exception handling.
删除触发器不需要异常处理。
As before, the delete trigger needs no modification.
与以前一样，删除触发器不需要修改。
The delete trigger does not depend on the coordinate values, so nothing changes there.
删除触发器不依赖于坐标值，所以这里不需要修改。
Listing 10 shows one approach, which is to bind the "Delete" trigger to a node in the data model, and then to make that node non-relevant when the count of nodes in the set reaches 1.
清单10给出了一种方法，那就是将“删除”触发器绑定到数据模型中的节点上，然后在节点集中的节点数达到1时使该节点变为不相关。
Listing 10 shows one approach, which is to bind the "Delete" trigger to a node in the data model, and then to make that node non-relevant when the count of nodes in the set reaches 1.
清单10给出了一种方法，那就是将“删除”触发器绑定到数据模型中的节点上，然后在节点集中的节点数达到1时使该节点变为不相关。
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