xmlDeclaration()
urlset( xmlns:'http://www.sitemaps.org/schemas/sitemap/0.9', 'xmlns:xsi':'http://www.w3.org/2001/XMLSchema-instance', 'xsi:schemaLocation':'http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd'){
    published_content.each {content ->
        url {
    	    loc("${config.site_host}${config.site_contextPath}${content.uri}")
    	    lastmod("${content.date.format('yyyy-MM-dd')}")
        }
    }
}