class PBInstance implements Comparable<PBInstance>, Serializable {

    @Override
    public String toString() {
        StringBuilder str = new StringBuilder();
        str.append(rolesetId+": ");
        
        str.append(predicateNode.getWord()+"\n");
        
        for (PBArg arg: args)
            str.append(arg+"\n");
        
        return str.toString();
    }

    public  PBInstance();

}