gistfile1.txt

definitions:
  Pet:
    type: object
    properties:
      name:
        type: string
      owner:
        type: string

  CreatePetRequest:
    allOf:
      - $ref: '#/definitions/Pet'
    required:
      - name
      - owner
  
  UpdatePetRequest:
    allOf:
      - $ref: '#/definitions/Pet'


###
# also doesn't work:

  CreatePetRequest:
    allOf:
      - $ref: '#/definitions/Pet'
    required:
      - $ref: '#/definitions/Pet/properties/name'
      - $ref: '#/definitions/Pet/properties/owner'