Does the dot Directed Graph allow for subgraphs with a different rankdir?

Question

Using the dot directed graph language, is it possible to create subgraphs with a different rankdir?

I tried the following, which didn't work. Both graphs were left to right, despite the presence of rankdir="TB" in the subgraph.

digraph g {
 rankdir="LR";
 LEFT->RIGHT;
 clusterrank="local";

 subgraph cluster1 { 
  rankdir="TB";    
  node[style=filled];   
  color=black;
  TOP->BOTTOM;    
 }  
}

Is there some other syntax to get a Top/Bottom and Left/Right graph in the same diagram, or is this not possible?

Answer 1

There's a clusterrank attribute for subgraphs, try this:

clusterrank=local;

Answer 2

Seems like this is a long standing feature request: http://www.graphviz.org/bugs/b1279.html