| Type | Location | Extends | Description |
|---|---|---|---|
| dag | dag_module | None | a directed acyclic graph (DAG). a collection of vertices (nodes) that are connected to other vertices. |
| edge | dag_module | None | the "to" vertex that defines an edge. This is part of the array of vertices contained without the "from" vertex type. an edge can also have optional attrubutes for graphviz. |
| vertex | dag_module | None | a vertex (or node) of a directed acyclic graph (DAG) |