LinkedList result = new LinkedList();
LinkedList<SIROperator> result = new LinkedList<SIROperator>();
    public List getChildren() {        // build result        LinkedList result = new LinkedList();        // add the children: the joiner, splitter, body, and loop        result.add(joiner);        result.add(getBody());        result.add(splitter);        result.add(getLoop());        // return result        return result;    }