def __ixor__(self, other):
return self.__i(<EOL>other=other,<EOL>func=lambda melt:<EOL>melt.name not in self and self.__setitem__(melt.name, melt)<EOL>)<EOL>
Put other element(s) which are not registered in this.

        :param ModelElement(s) other: element(s) to put in this content.
        :return: self.
        :raise: TypeError if other is not a ModelElement(s).