def __iadd__(self, other):
return self.__i(<EOL>other=other, func=lambda melt: self.__setitem__(melt.name, melt)<EOL>)<EOL>
Put ModelElement(s) in this content.

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