# Save the node in base
	#
	#     var client = new Neo4jClient("http://neo4j:7474")
	#
	#     # Create a node
	#     var andres = new NeoNode
	#     andres["name"] = "Andres"
	#     client.save_node(andres)
	#     assert andres.is_linked
	#
	# Once linked, nodes cannot be created twice:
	#
	#     var oldurl = andres.url
	#     client.save_node(andres) # do nothing
	#     assert andres.url == oldurl
	fun save_node(node: NeoNode): Bool do
		if node.is_linked then return true
		node.neo = self
		var batch = new NeoBatch(self)
		batch.save_node(node)
		# batch.create_edges(node.out_edges)
		var errors = batch.execute
		if not errors.is_empty then
			errors.add_all errors
			return false
		end
		local_nodes[node.url.to_s] = node
		return true
	end