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e3ace39
(Get the code!)
So. Let's posit a parent with an insertion point. We're parsing its kids. When we OpenContainer a kid or AddLeaf a kid, we stick it into the insertion point. Then when we call DidAddContent either in the same AddLeaf or when we CloseContainer the kid. Since we have an insertion point, DidAddContent notifies. Therefore, we cannot insert multiple kids into the insertion point without notifying on all but maybe the last of them.