In Graphviz, how do I align an edge to the top center of a node?

Question

In Graphviz / dot, is it possible to get the edge to connect exactly in the top center of a node? Reading the dot guide, I thought tailport and headport<

Answer 1

Turns out the most recent (2.38) version isn't working properly in Mac OS X Yosemite, I had to downgrade to 2.36 as noted in the download page.