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Decision

A Decision element determines an output value from a number of inputs (Input Data or other Decisions).

Semantics​

  1. Dependencies: A Decision reads values from the nodes pointing to it.
  2. Logic: It applies a Value Expression (Visualized as a Boxed Expression) to these inputs.
  3. Output: The result is bound to the Decision's variable name, making it available to downstream decisions.

Visual Representation​

In a DRD, a Decision is represented by a rectangle.

Execution​

The engine evaluates Decisions in topological order (dependencies first).

Inside "Is Adult?", the expression might be: if Age >= 18 then true else false