@abc.abstractmethod
    def fold(self, name, value):
        raise NotImplementedError
annotate exons within iterator.
dataset/ETHPy150Open OpenCobolIDE/OpenCobolIDE/open_cobol_ide/extlibs/future/backports/email/_policybase.py/Policy.fold--crossover with--dataset/ETHPy150Open CGATOxford/cgat/scripts/gtf2gff.py/annotateExons