Variations On The Definition
As already remarked, a common variation is to disallow arc multiplicities and replace the bag of arcs W with a simple set, called the flow relation, . This doesn't limit expressive power as both can represent each other.
Another common variation, e.g. in, e.g. Desel and Juhás (2001), is to allow capacities to be defined on places. This is discussed under extensions below.
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