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4 Fragment
Can be wrapped instead of div
You don’t have to wrap a div once in the diagram because when you parse, the Fragment gets thrown away and you don’t see anything wrapped around it
The same solution can be used with empty labels
The difference between
Fragments can write key values (the Fragment hierarchy is eventually discarded so writing other attributes makes no sense, does not receive and will report errors), but empty tags cannot write any attributes
The key value is required to participate in the traversal and the other times the blank label is ok
