<?xml version="1.0" encoding="UTF-8"?>
<!-- Two URLs, one per language. The Chinese page is a real file generated by
     tools/i18n/build-zh.mjs, not a client-side swap, so it can be indexed on its own.
     Each entry repeats the full alternate set — itself included — because that is the
     form Google accepts; the same set is inlined as <link rel="alternate"> in both
     pages, which is what other crawlers read. -->
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:xhtml="http://www.w3.org/1999/xhtml">
  <url>
    <loc>https://datasystem.school/</loc>
    <xhtml:link rel="alternate" hreflang="en" href="https://datasystem.school/"/>
    <xhtml:link rel="alternate" hreflang="zh-Hant" href="https://datasystem.school/zh/"/>
    <xhtml:link rel="alternate" hreflang="x-default" href="https://datasystem.school/"/>
    <lastmod>2026-08-06</lastmod>
    <changefreq>weekly</changefreq>
    <priority>1.0</priority>
  </url>
  <url>
    <loc>https://datasystem.school/zh/</loc>
    <xhtml:link rel="alternate" hreflang="en" href="https://datasystem.school/"/>
    <xhtml:link rel="alternate" hreflang="zh-Hant" href="https://datasystem.school/zh/"/>
    <xhtml:link rel="alternate" hreflang="x-default" href="https://datasystem.school/"/>
    <lastmod>2026-08-06</lastmod>
    <changefreq>weekly</changefreq>
    <priority>1.0</priority>
  </url>
</urlset>
