+ * Choice node is instance of one of possible alternatives, from which
+ * only one is allowed to exist at one time in particular context of parent node.
+ YANG Model and
+ * schema for choice is described by instance of {@link org.opendaylight.yangtools.yang.model.api.ChoiceNode}.
+ * Valid alternatives of subtree are described by instances of {@link org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode}
+ * which are retrieved via {@link org.opendaylight.yangtools.yang.model.api.ChoiceNode#getCases()}.