docs: def granules(self):
          """Return list of SentinelGranule objects."""
          for element in self._product_metadata.iter("Product_Info"):
              product_organisation = element.find("Product_Organisation")
          if self.product_format == 'SAFE':
              return [
                  SentinelGranule(_id.find("Granules"), self)
                  for _id in product_organisation.findall("Granule_List")
                  ]
          elif self.product_format == 'SAFE_COMPACT':
              return [
                  SentinelGranuleCompact(_id.find("Granule"), self)
                  for _id in product_organisation.findall("Granule_List")
                  ]
          else:
              raise Exception(
                  "PRODUCT_FORMAT not recognized in metadata file, found: '" +
                  str(self.safe_format) +
                  "' accepted are 'SAFE' and 'SAFE_COMPACT'"
              )