You could technically count a nap as "non-doing", but if you are dreaming during that nap, you are doing something.
你可以把睡午觉考虑为无为,但是如果你午休时做梦了的话,你就算是做了事情。
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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.