*/
    @Override
    public String getLastmod() {
        return lastmod;
    }

    /**
     * Sets the last modification date of this sitemap entry.
     * @param lastmod the last modification date to set
     */
    public void setLastmod(final String lastmod) {
        this.lastmod = lastmod;
    }

    /**
     * Returns the change frequency of this sitemap entry.

<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <sitemap>
      <loc>http://www.example.com/sitemap1.xml.gz</loc>
      <lastmod>2004-10-01T18:23:17+00:00</lastmod>
   </sitemap>
   <sitemap>
      <loc>http://www.example.com/sitemap2.xml.gz</loc>
      <lastmod>2005-01-01</lastmod>
   </sitemap>

     */
    @Override
    public String getLastmod() {
        return lastmod;
    }

    /**
     * Sets the last modification time of the sitemap.
     * @param lastmod the last modification time in W3C Datetime format
     */
    public void setLastmod(final String lastmod) {
        this.lastmod = lastmod;
    }

    /**
     * Checks if this SitemapFile is equal to another object.

   </url>
   <url>
      <loc>http://www.example.com/catalog?item=74&amp;desc=vacation_newfoundland</loc>
      <lastmod>2004-12-23T18:00:15+00:00</lastmod>
      <priority>0.3</priority>
   </url>
   <url>
      <loc>http://www.example.com/catalog?item=83&amp;desc=vacation_usa</loc>
      <lastmod>2004-11-23</lastmod>
   </url>