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import "time"

let MaxAge = 150

#Named: {
	firstName: string
	lastName:  string
}

#Timestamped: {
	createdAt: time.Format(time.RFC3339)
	updatedAt: time.Format(time.RFC3339)
}

// Embed definitions inside the body to compose them with new fields.
// & between two closed definitions cannot add new fields; embedding can.
#Person: {
	#Named
	#Timestamped
	age: int & >=0 & <=MaxAge
}

[...#Person]