Module type Graphviz.ATTRIBUTES

module type ATTRIBUTES = sig .. end
The ATTRIBUTES module type defines the interface for the engines.

type graph 
Attributes of graphs.
type vertex 
Attributes of vertices.
type edge 
Attributes of edges.
type subgraph = {
   sg_name : string; (*Box name.*)
   sg_attributes : vertex list; (*Box attributes.*)
   sg_parent : string option; (*Nested subgraphs.*)
}
Attributes of (optional) boxes around vertices.