def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def __init__(self, optional=False, choices=None):
        self._required = not optional
        self._choices = None  # Choices doesn't make sense for secrets