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For example, programmers can add new nodes, delete nodes, update the values of elements or attributes, and make other types of updates.
例如，程序员可以添加新节点、删除节点、更新元素或属性的值，以及进行其他类型的更新。
Delete these two nodes before we start drawing the model.
在开始绘制模型之前将这两个结点删除。
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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