This method information for the syntactic head, stored in TriggerInfo as this is the semi-standard terminology in the IE community.
This method information for the syntactic head, stored in TriggerInfo as this is the semi-standard terminology in the IE community. If an EventMention is provided, the synHead of the mention's trigger is used. Else, the synHead of the whole mention is used. If no synHead exists, the backoff is to use the whole mention (or trigger).
TriggerInfo, containing the (raw) text of the synHead "trigger" and the start and end char offsets