title: Jena-Fuseki requires dataset specified
body: <p>I have Jena-Fuseki server accessed via browser at <a href="http://localhost:3030/sparql.html" rel="nofollow">http://localhost:3030/sparql.html</a>. The query</p>
  
  <pre><code>select * where { }
  </code></pre>
  
  <p>results in an error:</p>
  
  <blockquote>
    <p>Error 400: No dataset description in protocol request or in the query string</p>
  </blockquote>
  
  <p>The query </p>
  
  <pre><code>select * from &lt;http://xmlns.com/foaf/0.1/&gt; where {}
  </code></pre>
  
  <p>results in an empty table.</p>
  
  <ol>
  <li>Example queries at <a href="http://www.w3.org/TR/sparql11-query/#WritingSimpleQueries" rel="nofollow">2.1 Writing a Simple Query</a> from the SPARQL specification  do not require a 'from' clause. How to configure Jena so that examples execute without errors?</li>
  <li>How to make a query to know which datasets are present in a database?</li>
  </ol>