# Extract the `MDoc` from `node` and link it to `mentity`.
	private fun set_doc(node: NeoNode, mentity: MEntity) do
		if node.has_key("mdoc") then
			var lines = new Array[String]
			for e in node["mdoc"].as(JsonArray) do
				lines.add e.to_s#.replace("\n", "\\n")
			end
			var location = to_location(node["mdoc_location"].to_s)
			var mdoc = new MDoc(location)
			mdoc.content.add_all(lines)
			mdoc.original_mentity = mentity
			mentity.mdoc = mdoc
		end
	end