# Build a new `MPackage` from a `node`.
	#
	# REQUIRE `node.labels.has("MPackage")`
	private fun to_mpackage(model: Model, node: NeoNode): MPackage do
		var m = mentities.get_or_null(node.id.as(Int))
		if m isa MPackage then return m

		assert node.labels.has("MPackage")
		var location = to_location(node["location"].to_s)
		var mpackage = new MPackage(node["name"].to_s, model, location)
		mentities[node.id.as(Int)] = mpackage
		set_doc(node, mpackage)
		mpackage.root = to_mgroup(model, node.out_nodes("ROOT").first)
		return mpackage
	end