public boolean equals(Object obj) {
        if (obj == this) {
            return true;   
        }
        if (!(obj instanceof CompositeTitle)) {
            return false;   
        }
        if (!super.equals(obj)) {
            return false;   
        }
        CompositeTitle that = (CompositeTitle) obj;
        if (!this.container.equals(that.container)) {
            return false;   
        }
        return true;