}
    }


    @Override
    public DfsReferralDataImpl next () {
        return this.next;
    }


    /**
     * 
     * @param dr
     */
    @Override
    public void append ( DfsReferralDataInternal dr ) {
        DfsReferralDataImpl dri = (DfsReferralDataImpl) dr;
        dri.next = this.next;
        this.next = dri;
    }


    /**