Sitemap for Umbraco with SEO metadata package installed

SitemapXml.cshtml

@using Page = Website.Core.Models.UmbracoPage
@inherits UmbracoTemplatePage

@{
    Layout = null;
    // Forces the doc type declaration on the first line.
    Response.Write(@"<?xml version=""1.0"" encoding=""UTF-8"" ?>");

    Response.ContentType = "text/xml";
    var root = Model.Content.Ancestor<Page>();
}

@*http://www.sitemaps.org/protocol.html*@

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    @OutputAndRecurse(root)
</urlset>

@helper OutputAndRecurse(Page node)
{
    var metadata = node.Metadata;
    var sitemapXmlPriority = node.SitemapXmlPriority;
    var sitemapXmlChangeFrequency = node.SitemapXmlChangeFrequency;

    if ((metadata == null || !metadata.NoIndex)
        && node.IsVisible()
        && node.Id != Model.Content.Id)
    {
        <url>
            <loc>@node.UrlWithDomain()</loc>
            <lastmod>@(string.Format("{0:s}+00:00", node.UpdateDate))</lastmod>

            @if (!string.IsNullOrWhiteSpace(sitemapXmlPriority))
            {
                <priority>@sitemapXmlPriority</priority>
            }

            @if (!string.IsNullOrWhiteSpace(sitemapXmlChangeFrequency))
            {
                <changefreq>@sitemapXmlChangeFrequency</changefreq>
            }
        </url>
    }

    foreach (var child in node.Children<Page>())
    {
        @OutputAndRecurse(child)
    }
}