def get_reference(self):
        return PolicyTypeReference(resource_type=self.resource_type, name=self.name)
identify intervals overlapping chromatin mark intervals for each datasets
dataset/ETHPy150Open StackStorm/st2/st2common/st2common/models/db/policy.py/PolicyTypeDB.get_reference--crossover with--dataset/ETHPy150Open CGATOxford/cgat/obsolete/pipeline_proj007.py/getChromatinMarkOverlap