<?xml version="1.0" encoding="UTF-8"?>
<!--
  Optionally add <image:image> entries below once you have static/og-image.png.
-->
<urlset
  xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
  xmlns:image="http://www.google.com/schemas/sitemap-image/1.1"
  xmlns:xhtml="http://www.w3.org/1999/xhtml">

  <!-- Main page (Russian, default) -->
  <url>
    <loc>https://bubblechart.ru/</loc>
    <lastmod>2026-02-23</lastmod>
    <changefreq>daily</changefreq>
    <priority>1.0</priority>

    <!-- hreflang alternates for multilingual signal to Google -->
    <xhtml:link rel="alternate" hreflang="ru"        href="https://bubblechart.ru/"/>
    <xhtml:link rel="alternate" hreflang="en"        href="https://bubblechart.ru/?lang=en"/>
    <xhtml:link rel="alternate" hreflang="x-default" href="https://bubblechart.ru/"/>

    <!--
      OG image entry — uncomment once static/og-image.png (1200×630) is created:
      <image:image>
        <image:loc>https://bubblechart.ru/static/og-image.png</image:loc>
        <image:title>Stock and Crypto Bubble Chart — Live Market Visualization</image:title>
        <image:caption>Interactive D3.js bubble chart showing US stocks, Russian stocks, and cryptocurrencies by market cap and price change.</image:caption>
      </image:image>
    -->
  </url>

  <!-- English variant — same page, different lang parameter -->
  <url>
    <loc>https://bubblechart.ru/?lang=en</loc>
    <lastmod>2026-02-23</lastmod>
    <changefreq>daily</changefreq>
    <priority>0.9</priority>

    <xhtml:link rel="alternate" hreflang="ru"        href="https://bubblechart.ru/"/>
    <xhtml:link rel="alternate" hreflang="en"        href="https://bubblechart.ru/?lang=en"/>
    <xhtml:link rel="alternate" hreflang="x-default" href="https://bubblechart.ru/"/>
  </url>

</urlset>
