 attribute
for ways of restricting the node size.
In particular, if <tt>fixedsize=shape</tt>, the node's shape will be fixed
by the <A HREF=attrs.html#d:width><TT>width</TT></A> and
<A HREF=attrs.html#d:height><TT>height</TT></A> attributes, and the shape
is used for edge termination, but both the shape and label sizes are used
preventing node overlap. For example, the following graph
<XMP>
digraph G {
  { 
    node [margin=0 fontcolor=blue fontsize=32 width=0.5 shape=circle style=filled]
    b [fillcolor=y