cpettitt/dagre — pull request #55 by ress (2013-02-18 17:22:51+00:00)
Title: Handling default attributes for node/edge/graph statements

I saw this was a feature request for dig.js and implemented it for dagre.

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Default attributes apply to all statements following them:
digraph G {
n0 [label="colorless node"]
node [color=green font=Helvetica];
n1 [label="green node"]; /* color=green and font"Helvetica are added automatically */
}

Multiple default attribute statements are merged, and newer attributes have
precedence over older attributes:
digraph G {
node [color=green font=Helvetica];
node [color=yellow];
n0 [label="yellow node"]; /* font=Helvetica is added automatically */
}