graph g_service {
	graph[fontname="'Source Sans Pro', sans-serif", fontsize=12.0];
	node[shape=Mrecord, fontname="'Source Sans Pro', sans-serif", fontsize=10.0,
	     color=lightgray, style=filled, fillcolor=white];
	edge[color=lightgray];
	rankdir=LR
	compound=true

	Account [label="Account||Username()\lVerify(password)\l"]
	Order [label="Order|placed\l|Items() []Item\lCompleted() bool\l"]
	Item  [label="Item|label\l|Price(currency)\l"]
	Calculator  [label="Calculator|currency\l|Sum(items ...Item)\l"]

	Order -- Account  [taillabel="*", headlabel="1", labeldistance=0.7]
	Order -- Item     [taillabel="*", headlabel="+", labeldistance=0.7]
	Item -- Calculator

}