Check if this genomic region is on the positive strand.

    :return: True if this element is on the positive strand

def isPositiveStrand(self):
    """
    Check if this genomic region is on the positive strand.

    :return: True if this element is on the positive strand
    """
    if self.strand is None and self.DEFAULT_STRAND == self.POSITIVE_STRAND:
      return True
    return self.strand == self.POSITIVE_STRAND