types:
  person:
    properties:
      :id: 'ID #'
      :first: First
      :last: Last
      :smoker: Smoker
      :dob: DOB
  car:
    properties:
      id: 'Car ID #'
      make: Make
      model: Model
      year: Year
  house:
    :properties:
      id: 'House ID #'
      st1: Street 1
      st2: Street 2
      city: City
      st: St
      zip: Zip
  plate:
    :properties:
      id: 'Plate ID #'
      number: Plate Number
groups:
  people:
    by: 'ID #'
    type: person
    groups:
      :cars:
        by: 'Car ID #'
        type: car
        groups:
          plates:
            by: 'Plate ID #'
            type: plate
      houses:
        by: 'House ID #'
        type: house
  cars:
    by: 'Car ID #'
    type: car