inputs:
  text:
    type: string
outputs:
  text:
    type: string
    reference: ${node_a.output}
nodes:
- name: node_a
  type: python
  source:
    type: code
    path: node_a.py
  inputs:
    input1: ${inputs.text}
- name: node_b
  type: python
  source:
    type: code
    path: node_b.py
  inputs: {}
  activate:
    when: ${node_a.output}
    is: hello world
