title: Validation of XML Sitemap urlset with xhtml:link inside url element
body: <p>I am trying to create a sitemap such as the below and I get this error:</p>
  
  <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt;
    &lt;urlset
      xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" 
      xmlns:xhtml="http://www.w3.org/1999/xhtml" 
      xhtml:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
          http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"&gt;
       &lt;url&gt;
           &lt;loc&gt;http://www.something.com/something&lt;/loc&gt;
           &lt;xhtml:link rel="alternate" hreflang="en-us" href="http://www.something.com/something" /&gt;
       &lt;/url&gt;
   &lt;/urlset&gt;
  </code></pre>
  
  <p>Error:</p>
  
  <blockquote>
    <p><a href="http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" rel="noreferrer">http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd</a>"> ^ Error 1866: Element '{<a href="http://www.sitemaps.org/schemas/sitemap/0.9" rel="noreferrer">http://www.sitemaps.org/schemas/sitemap/0.9</a>}urlset', attribute '{<a href="http://www.w3.org/1999/xhtml" rel="noreferrer">http://www.w3.org/1999/xhtml</a>}schemaLocation': The attribute '{<a href="http://www.w3.org/1999/xhtml" rel="noreferrer">http://www.w3.org/1999/xhtml</a>}schemaLocation' is not allowed. on line: 3</p>
    
    <p>'{<a href="http://www.w3.org/1999/xhtml" rel="noreferrer">http://www.w3.org/1999/xhtml</a>}link': No matching global element declaration available, but demanded by the strict wildcard. </p>
  </blockquote>
  
  <p>Please advice. Thank you.</p>