title: Can I merge an unknown named graph with an other in a SPARQL query?
body: <p>I want to query on two different named graphs as the default graph with SPARQL:</p>
  
  <pre><code>SELECT *
  FROM &lt;graph1&gt;
  FROM &lt;graph2&gt;
  WHERE {
      ...
  }
  </code></pre>
  
  <p>My problem is that I don't know the URI of <code>&lt;graph1&gt;</code>, but I know a specific triple of <code>&lt;graph1&gt;</code> allowing me to find his URI.</p>
  
  <pre><code>SELECT ?g
  WHERE {
      GRAPH ?g {
          eg:MyKnownURI a eg:Element.
      }
  }
  </code></pre>
  
  <p>Currently, I have to perform the second query to get <code>&lt;graph1&gt;</code> and next, I can perform the first query.</p>
  
  <p>Is there a syntax to perform the two requests in one ?</p>