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Comment by lmm | Hacker News Reader

It happens with any tree structure. E.g. I used to work on a system that managed reinsurance contracts and represented them as trees of contracts.

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Did the elements often have immediate child elements that had immediate child elements (and so on) of the same type? Like:

  <contract><contract><contract><contract> […]

No, there were a couple of layers in that case. But that doesn't actually help you add a child at the correct level, because the end of a contract would look something like:

                ...
                </contract>
              </subcontracts>
            </content>          
          </contract>
        </subcontracts>
      </content>
    </contract>

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