%YAML 1.2
---
version: 1.1

a_variable: a value  # A first variable

a_family:  # A family

  a_bock:
    description: A block
    hcl_type: block

    a_label:
      description: A label
      hcl_type: label

      a_variable:
        description: A variable with a value
        default:
          variable: ____.a_variable
...