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Option__Exercise_Type

Exercise Type refers to List of the possible schedules defining when the option holder is allowed to exercise the option.
Available Exercise Type types:
American
The option holder may exercise at any time up to some pre-specified exercise date only.
Bermudan
The option holder may exercise at any date out of a pre-specified set of exercise dates only.
European
The option holder may exercise at a pre-specified single exercise date only.
Mixed
The most general case where both american and bermudan features may apply.
A pre-specified set of single dates and/or date intervals determine when the option holder is allowed to exercise.
Unfortunately QuantLib can for now process only a single exercise interval, which then treats as an american exercise - "american" in the QuantLib sense - with specified start and end dates.