docs: def load(self, elem):
          """
          Converts the inputted set tag to Python.
          
          :param      elem | <xml.etree.ElementTree>
          
          :return     <set>
          """
          self.testTag(elem, 'set')
          out = set()
          for xitem in elem:
              out.add(XmlDataIO.fromXml(xitem))
          return out