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 # gem-graph is for: GE-ometric directed M-ulti-GRAPH
 
 A geometric graph is a graph whose nodes have coordinates in a space
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 A graph is directed if its bonds are arrows
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 It is a multigraph if several arrows can be stacked from one node to another one
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 Note that 'directed' does not means 'oriented': a graph is oriented if one of its nodes is its root
 
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 Geometric directed multigraphs have properties that make them suitable for the representation of complex phenomena,
 especially those where numerous different objects and types of interactions are involved.