Has the syntax (style)?(seed)?.
If style is present, it must be one of the strings:
"regular": place nodes regularly about a circle"self": run an abbreviated version of neato to obtain the initial layout"random": place nodes randomly in a unit square.If seed is present, it specifies a seed for the random number generator. If seed is a positive number, this is used as the seed. If it is anything else, the current time, and possibly the process id, is used to pick a seed, thereby making the choice more random. In this case, the seed value is stored in the graph.
If the value is just "random", a time-based seed is chosen.
Note that input positions, specified by a node's pos attribute, are only used when the style is "random".
startType is a valid type for:
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attr-types/startType/