xml.instruct! xml.urlset ‘xmlns’ => ‘www.sitemaps.org/schemas/sitemap/0.9’ do

resources_for_sitemap.each do |page|
  xml.url do
    xml.loc url_proc.call(File.join(url_root, page.url))
    xml.lastmod(File.mtime(page.source_file).iso8601) if page.source_file
    xml.changefreq page.data.changefreq || changefreq_proc.call(page.url)
    xml.priority page.data.priority || priority_proc.call(page.url)
  end
end

end