def sitemap_meta_lastmod
      return controller.sitemap_meta_data[:lastmod].blank? ? nil : tag(:meta, {name: "Last-Modified", content: controller.sitemap_meta_data[:lastmod]}, false, false)
    end
def sitemap_meta_lastmod
      return controller.sitemap_meta_data[:lastmod].blank? ? nil : tag(:meta, {name: "Last-Modified", content: controller.sitemap_meta_data[:lastmod]}, false, false)
    end
Generates a Last-Modified meta tag for use inside HTML header area.
 @return [String] HTML safe Last-Modified meta tag.