title: Case insensitive match in SPARQL triple
body: <p>Is there a way to make the following query case insensitive?</p>
  
  <pre><code>ASK {
      VALUES (?r) { (dbr:Game_of_Thrones) }
          { ?r ?p ?o }
          UNION
          { ?s ?r ?o }
          UNION
          { ?s ?p ?r }
      }
  </code></pre>
  
  <p>It shall return true no matter if I use <code>dbr:Game_of_Thrones</code> or <code>dbr:game_of_thrones</code>.</p>
  
  <p>I tried using <code>LCASE()</code> but it's not allowed inside the triples. Is there another way?
  I'm using the DBpedia SPARQL endpoint (<a href="https://dbpedia.org/sparql" rel="nofollow noreferrer">https://dbpedia.org/sparql</a>).</p>