digraph G {
layers="local:pvt:test:new:ofc";
node1 [layer="pvt"];
node2 [layer="all"];
node3 [layer="pvt:ofc"]; /* pvt, test, new, and ofc */
node2 -> node3 [layer="pvt:all"]; /* same as pvt:ofc */
node2 -> node4 [layer=3]; /* same as test */
}