# Make a new `NeoNode` based on `mentity`.
	private fun make_node(nodes: HashMap[MEntity, NeoNode], model_name: nullable String): NeoNode do
		var node = new NeoNode
		nodes[self] = node
		node.labels.add "MEntity"
		if model_name != null then node.labels.add model_name
		node["name"] = self.name
		if not self isa MSignature then
			#FIXME: MSignature is a MEntity, but has no model :/
			node["location"] = self.location.to_s
		end
		var mdoc = self.mdoc
		if mdoc != null then
			node["mdoc"] = new JsonArray.from(mdoc.content)
			node["mdoc_location"] = mdoc.location.to_s
		end
		return node
	end