addDouble
A double with an optional prefix '+'.
The following list gives the legal strings corresponding to values of the given types. The syntax for describing legal type strings is a mixture of literal strings, stdio encodings (e.g., %f for a double), and regular expressions. For regular expressions, (...)* indicates 0 or more copies of the expression enclosed in the parentheses, (...)+ indicates 1 or more, and (...)? denotes 0 or 1 copy.
Edge arrowhead shape
Boolean; true or false.
List of (optionally weighted) color values, forming a linear gradient
Edge arrow direction type
Double-precision floating point number
List of doubles
String with backslashed escape sequences
Integer number
A list of layers defined by the layers attribute
Label string
The order in which nodes and edges are drawn in output.
How closely to pack together graph components
Page Direction
2-dimensional (or 3-dimensional) geometrical point in space
Port Position: where on a node an edge should be aimed
Quadtree scheme
Direction to draw directed graphs (one rank at a time)
Rank constraints on the nodes in a subgraph
How to initially layout nodes
Text; a sequence of characters.
Clipping window on final drawing
List of graphical operations in Graphviz's xdot language.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attr-types/