<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <% @articles.each do |path, last_comment_at| %>
    <url>
        <loc><%= app_url(path) %></loc>
        <lastmod><%= last_comment_at.strftime("%F") %></lastmod>
    </url>
  <% end %>
</urlset>
