title: Can a relative sitemap url be used in a robots.txt?
body: <p>In robots.txt can I write the following relative URL for the sitemap file?</p>
  
  <pre><code>sitemap: /sitemap.ashx
  </code></pre>
  
  <p>Or do I have to use the complete (absolute) URL for the sitemap file, like:</p>
  
  <pre><code>sitemap: http://subdomain.domain.com/sitemap.ashx
  </code></pre>
  
  <p>Why I wonder:</p>
  
  <ul>
  <li>I own a new blog service, www.domain.com, that allow users to blog on accountname.domain.com.</li>
  <li>I use wildcards, so all subdomains (accounts) point to: "blog.domain.com".</li>
  </ul>
  
  <p>In blog.domain.com I put the robots.txt to let search engines find the sitemap.
  But, due to the wildcards, all user account share the same robots.txt file.Thats why I can't use the second alternative. And for now I can't use url rewrite for txt files. (I guess that later versions of IIS can handle this?)</p>