this.publicationLanguage = publicationLanguage;
    }

    /**
     * Gets the publication date.
     * @return the publication date
     */
    public String getPublicationDate() {
        return publicationDate;
    }

    /**
     * Sets the publication date.
     * @param publicationDate the publication date to set
     */

    public void setDuration(final String duration) {
        this.duration = duration;
    }

    /**
     * Gets the publication date.
     * @return the publication date
     */
    public String getPublicationDate() {
        return publicationDate;
    }

    /**
     * Sets the publication date.
     * @param publicationDate the publication date to set
     */