Copyright (c) 2011 Michael Ruflin, Andr� Locher, Claudia von Bastian.
This file is part of Tatool.
Tatool is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Tatool is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with Tatool. If not, see <http://www.gnu.org/licenses/>.
Element that holds two child elements, the execution of which is alternated when a
special ExecutionOutcome is returned by a containing element execution.
This returns a list containing primary and secondary element.
Updates the children object.