> It appears 
> that an edge can have one source and one target. If true, 
> that means that I can't use it.

That's the normal definition of an edge. 
> 
> What appears to be ambiguous is, I suspect, merely the fact 
> that in the model I am representing a node can have more than 
> one predecessor node and more than one successor node.

That's normal too. If a node has three predecessors then it has three
"inbound" edges, one from each predecessor.

Michael Kay


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