---
elements:
    - name: a
      constraints:
        - type: MinMaxFields
          min: 1
          max: 2
          others:
            - 'b'
            - 'c'
            - 'd'
          when:
            any_field:
              - 'a'
              - 'b'
              - 'c'
              - 'd'
    
    - name: b
    
    - name: c
    
    - name: d