title: A SPARQL query that works in the DBpedia endpoint but not with ARC2
body: <p>the query is the following :</p>
  
  <pre><code>PREFIX rdfs: &lt;http://www.w3.org/2000/01/rdf-schema#&gt;
  
  SELECT distinct ?value
      from &lt;http://fr.dbpedia.org&gt;
      WHERE{                                          
  
          ?sub rdfs:label ?value.                     
                      FILTER (CONTAINS(LCASE(?value), 'data')).                                                           
          }
  
  limit 10  
  </code></pre>
  
  <p>it works perfectly fine using the <a href="http://fr.dbpedia.org/sparql" rel="nofollow noreferrer">DBpedia endpoint</a> but when I try to use it from PHP using ARC2 I get the following error :</p>
  
  <blockquote>
    <p>Query errorsArray (  [0] => Incomplete FILTER in
    ARC2_SPARQLPlusParser [ 1] => Incomplete or invalid Group Graph
    pattern. Could not handle " " in ARC2_SPARQLPlusParser )</p>
  </blockquote>
  
  <p>Any ideas what could be the problem ? 
  thank's!</p>