def _checkBoundingRegionSortedPair(self, lastBoundingRegion, br):
GenomeElementSource._checkBoundingRegionSortedPair(self, lastBoundingRegion, br)
if br.start is not None and br.end is not None:
if lastBoundingRegion.end == br.start:
raise InvalidFormatError("Error: bounding regions '%s' and '%s' are adjoining (there is no gap between them)." % (lastBoundingRegion, br))
