Viz/graphviz.org+doc+info+attrs.html
From VistApedia
graph G { B \-\- A [taillabel = "tail"] }
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digraph G { graph [class="cats"]; subgraph cluster_big { graph [class="big_cats"]; "Lion" [class="yellow social"]; "Snow Leopard" [class="white solitary"]; } }
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digraph G {
a -> b [dir=both color="red:blue"] c -> d [dir=none color="green:red;0.25:blue"]
}