Option Exercise Style. 2015-10-16 exerciseStyleScheme 1-1 http://www.fpml.org/coding-scheme/generic-exercise-style http://www.fpml.org/coding-scheme/generic-exercise-style-1-1 http://www.fpml.org/coding-scheme/generic-exercise-style-1-1.xml Code 63 Source Description key American FpML Option can be exercised on any date between a commencement date and an expiration date. Bermuda FpML Option can be exercised on a specific set of exercise dates. European FpML Option can be exercised once on a specified expiration date.