---
---
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml">
  {% for coll in site.all_collections %}
    {% for page in site[coll] %}
      {% comment %}
        page ref is nil for generated pages, such
        as post.html.1.txt code snippets
      {% endcomment %}
      {% if page.ref != nil %}
        <url>
          <loc>{{ site.url }}{{ page.url }}</loc>
          {% assign ref=page.ref %}
          {% if page.ref == 'root' %}
            {% assign ref='index' %}
          {% endif %}
          {% assign versions=site[coll] | where:"ref", ref %}
          {% for version in versions %}
            <xhtml:link rel="alternate" hreflang="{{ version.lang }}" href="{{ site.url }}{{ version.url }}" />
          {% endfor %}
          {% if page.date != nil %}
            <lastmod>{{ page.updated_at | default: page.date | date_to_xmlschema }}</lastmod>
          {% endif %}
          <changefreq>monthly</changefreq>
        </url>
      {% endif %}
    {% endfor %}
  {% endfor %}
</urlset>