def problem_id(self, value):
        """The problem_id property.
        
        Args:
            value (string). the property value.
        """
        if value == self._defaults['problemId'] and 'problemId' in self._values:
            del self._values['problemId']
        else:
            self._values['problemId'] = value
The problem_id property.
        
        Args:
            value (string). the property value.