A graph describing the interaction of an user with a wiki.

[http://www.graphviz.org/ GraphViz] source:
 digraph {
 	display [label="browse page"]
 	source [label="edit source text"]
 	links [label="query backlinks"]
 	display -> source [label="edit/create"]
 	display -> links [label="link"]
 	links -> display [label="read"]
 	display -> display [label="read"]
 	source -> display [label="write", style="dashed,bold"]
 }