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Posted by quant
Oct 26, 2007 at 09:35 AM
In general, you have a graph as the underlying structure in your outliner.
From graph theory, there are directional and undirected graphs
http://en.wikipedia.org/wiki/Glossary_of_graph_theory#Direction
Most often, outliners provide only trees - a connected graph with no loops.
UltraRecall, for example, provides “logical linking”, which means undirected connection.
Hyperlinks (in UltraRecall called internal links), provide directed connection