DefaultParser returns a singleton Parser.

IsEventTypeOneof returns true iff the field is a oneof and is marked with option (mir.event_type) = true.

IsoriginRequest returns true iff the field is marked with [(mir.origin_request) = true].

IsoriginResponse returns true iff the field is marked with [(mir.origin_response) = true].

OmitInEventConstructor returns true iff the field is marked with [(mir.omit_in_event_constructor) = true].

EventNode represents a node in the tree corresponding to the hierarchy of events.

Origin represents a field marked with [(mir.origin_request) = true] or [(mir.origin_response) = true].