title: SPARQL query using multiple datasources
body: <p>I have my default graph and I need to extend the data using DBpedia.</p>
  
  <p>I have mapped all instances from my data with their respective URIs from DBpedia, using <code>owl:sameAs</code> property.</p>
  
  <p>This query returns all the <code>owl:sameAs</code> data: 
  (My endpoint: <a href="http://dydra.com/brunopenteado/br_municipalities/@query" rel="nofollow">http://dydra.com/brunopenteado/br_municipalities/@query</a>)</p>
  
  <pre><code>select * 
    where 
      { 
        ?mun owl:sameAs ?db .
      } 
    limit 10
  </code></pre>
  
  <p>Now I want to query the <code>rdfs:label</code> from DBpedia using my data. </p>
  
  <p>How can I build a query that reads my data and extends to DBpedia properties as well?</p>
  
  <p>I tried a query like this, but no results are returned.</p>
  
  <pre><code>select * 
    from &lt;http://dydra.com/brunopenteado/br_municipalities/sparql&gt;
    from &lt;http://pt.dbpedia.org/sparql&gt;
  where 
    { 
      ?mun owl:sameAs ?dbp .
      ?dbp rdfs:label ?name
    } 
  limit 10
  </code></pre>