How to create nodes in a vertical column?

I don't see a location, x or y attribute.

http://www.graphviz.org/content/attrs

Hello,

How can I export nodes coordinates after plotting a graph?

Thanks,
Pedram

Dear sir, Is it possible to change the labels of the nodes in output of dot. If yes how? thanks in advance. shijo

I'm interested in drawing a graph where a new copy of a node is made each time it's used.

To put it another way, every time a node is used, I'd like to have a new circle in the graph so the full tree structure of the graph appears, rather than a more standard state diagram.

To put it a third way, is there some Graphviz option that makes a graph like:

digraph A {
node1->node2
node3->node2
}

End up looking like the following graph?

digraph B {
node2a [label="node2"]
node2b [label="node2"]

node1->node2a
node3->node2b
}