schema Package2 {
	installed : Bool

	final name = ""
	final version = "latest"
	final source = "default"
	final provider = "apt"

	synchronized sub install {
		effect {
			this.installed = true
		}
	}

	synchronized sub uninstall {
		condition {
			this.installed = true
		}
		effect {
			this.installed = false
		}
	}
}