/**
     * Validates the data in event to be appropriate for the
     * {@link DropHandler#drop(DragAndDropEvent)} method.
     * <p>
     * Note that even if your criterion is validated on client side, you should
     * always validate the data on server side too.
     * 
     * @param dragEvent
     * @return
     */
/**
     * Validates the data in event to be appropriate for the
     * {@link DropHandler#drop(DragAndDropEvent)} method.
     * <p>
     * Note that even if your criterion is validated on client side, you should
     * always validate the data on server side too.
     * 
     * @param dragEvent
     * @return
     */ | AcceptCriterion.java