avocado> var Graph = require("graph").Graph;

avocado> g = new Graph("graph", "vertices", "edges");
Graph("vertices", "edges")

avocado> v = g.addVertex(null, { name : "Hugo" });
Vertex(<graph>, "153246:2310672")

avocado> v.getPropertyKeys();
[ "name" ]

avocado> v.setProperty("email", "hugo@hugo.de");
"hugo@hugo.de"

avocado> v.getPropertyKeys();
[ "name", "email" ]