A custom event is generally obtained from a parse with some module or other library's events included.
Captures the knowledge that an object was derived from some procedure.
Represents an event where an object is read from a file.
An abstraction of some event in the history of some object.
Represents the provenance and subsequent transformations of a given object.
A single event to be recorded in an object's history.
Represents the adding of a graph object by a user interactively.