Consider and When Nodes

[consider] and [when] nodes are similar to Ask Node, but instead of asking the user what to do, they look at the current Current Value. Use these nodes to avoid asking questions whose answers can be inferred from information the questionnaire already has. While both nodes look at the Current Value, when nodes are able to look at any combination of values, while consider nodes provide a more syntactically pleasent way of examining a single slot.

Both nodes provide an else sub-node, which is selected when none of the other options matches. These nodes are similar to the if and switch keywords in other languages.

Consider node

<* SubjectType may have been collected above *>
[>cn< consider:
  {slot: SubjectType}
    {mineral: [set: Harm=minimal]}
    {animal:  [set: Harm=moderate]}
    {human:   [call: assesHumanHarm]}
  {else: <-- this part is optional
    [call: open-data]

In the above example, we use a consider node to infer the appropriate value of the Harm slot from the value at the SubjectType slot. If, for example, >cn< is arrived at when SubjectType contains animal, the questionnaire declares the harm the dataset in question may cause is moderate. If, on the other hand, >cn< is arrived at when the subject type is human, the questionnaire goes into a special section for assessing the harm.

When node

When nodes are a more general form of [consider]. They can describe any combination of values in the slots.

  {Subjects+=livingPresons: [call: privacy]}
  {Subjects+=deceasedPresons; Domains += medical: [call: privacy]}
    [call: open-data]