- a [[list]].
  - [[monochrome]]
    - [[qr code]]
    - [[aztec code]]
    - [[maxicode]]
    - [[data matrix]] up to 2.3k chars
    - [[SPARQCode]]
    - [[PDF417]]
  - [[color]]
    - #pull [[color qr]]
    - [[jab]]
    - [[hccb]]