%YAML 1.2
---
version: 1.1

var1:
  description: the first variable
  choices:
    - a
    - b
    - c

var2:
  description: the second variable
  choices:
    - a
    - b
    - c

var3:
  description: the third variable
  mandatory: false
  choices:
    - a
    - b
    - c

var4:
  description: the forth variable
  mandatory: false
  choices:
    - null
    - b
    - c

var5:
  description: the fifth variable
  default: a
  choices:
    - a
    - b
    - c

var6:
  description: the sixth variable
  default: 1
  choices:
    - 1
    - 2
    - 3
...