(event:) has embedded:
	(action:) -- required
		move, take, drop
	(entity:) -- required
	(destination:) -- for some actions

(entity:) has embedded:
	(type:)
	(color:)
	(indicator:) -- for position adjectives: "left"
	(ordinal:)
	(cardinal:) -- used for entities in measures
	(spatial-relation:)
		(relation:) -- required
		(entity:) -- ?required?
		(measure:) -- optional
			(entity:) -- required