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To-Do Node

A placeholder node, to be later replaced with real a decision graph. Can be referenced from Call nodes, so that when the node is replaced with the decision graph that implements it, the referring code does not need to change.

[todo: implement tagging for financial data]

[todo] nodes are useful for top-down implementation approaches, where the questionnaire structure is decided early on, but its parts are implemented gradually, like so:

[ask
  {text: Do the data contain health information?}
  {answers:
    {yes: [call healthInfo]}}]
[ask
  {text: Do the data contain financial information?}
  {answers:
    {yes: [call financialInfo]}}]
[todo: tag for data use agreements]
[end]

[>healthInfo< todo: implement!]
[end]

[>financialInfo< todo: implement!]
[end]

The questionnaire in the above example can be executed even though three parts of it have not been implemented yet.