A team of game developers is using Cloud Firestore to store player data, including character description, character state, and possessions. Descriptions are up to a 60-character alphanumeric string that is set when the character is created and not updated. Character state includes health score, active time, and passive time. When they are updated, they are all updated at the same time. Possessions are updated whenever the character acquires or loses a possession. Possessions may be complex objects, such as bags of items, where each item may be a simple object or another complex object. Simple objects are described with a character string. Complex objects have multiple properties. How would you model player data in Cloud Firestore?