class Chapter extends ModelBase {

    get name() {
        return this.name;
    }

    get number() {
        return this._number;
    }

    get relativeUrl() {
        return this._relativeUrl;
    }

    constructor(name, number, relativeUrl) {
        super();
        this.name = name;
        this._number = number;
        this._relativeUrl = relativeUrl;
    }
}