title: What is after LINQ?
body: <p>In the spirit of</p>
  
  <p><a href="https://stackoverflow.com/questions/16322/all-about-linq">All about LINQ</a></p>
  
  <p>Current LINQ providers:</p>
  
  <ul>
  <li>LINQ to Objects.</li>
  <li>LINQ to SQL.</li>
  <li>LINQ to XML.</li>
  <li>LINQ to Entities.</li>
  <li>LINQ to WMI.</li>
  <li>LINQ to LDAP.</li>
  <li>LINQ to Internet.</li>
  <li>LINQ to Dataset.</li>
  <li>LINQ to nHibernate.</li>
  </ul>
  
  <p>So, what is after LINQ?
  Does there any data source LINQ not cable of querying it?</p>
  
  <p><strong>[Edit]</strong>
  From Adam Robinson's answer:
  What sort of data source (if any) doesn't lend itself toward a formal query definition?</p>