Converts the inputted string tag to Python.
        
        :param      elem | <xml.etree.ElementTree>
        
        :return     <str>

def load(self, elem):
        """
        Converts the inputted string tag to Python.
        
        :param      elem | <xml.etree.ElementTree>
        
        :return     <str>
        """
        self.testTag(elem, 'str')
        return elem.text if elem.text is not None else ''