diff -r a2342f26c9de -r b0b56e0f8c7f server/src/app/Repositories/RdfDocumentRepository.php
--- a/server/src/app/Repositories/RdfDocumentRepository.php	Fri Jan 15 15:27:56 2016 +0100
+++ b/server/src/app/Repositories/RdfDocumentRepository.php	Fri Jan 15 15:35:00 2016 +0100
@@ -40,6 +40,9 @@
             $newGraph->add($doc->uri, "http://www.europeana.eu/schemas/edm/aggregatedCHO", $doc->doc);
             $newGraph->add($doc->doc, "rdf:type", $newGraph->resource("http://www.europeana.eu/schemas/edm/ProvidedCHO"));
             $newGraph->add($doc->doc, "http://purl.org/dc/elements/1.1/title", $doc->title);
+            if(isset($doc->lang)) {
+                $newGraph->add($doc->doc, "http://purl.org/dc/elements/1.1/language", $doc->lang);
+            }
             if(isset($doc->issued)) {
                 $newGraph->add($doc->doc, "http://purl.org/dc/terms/issued", $doc->issued);
             }
@@ -55,10 +58,11 @@
     public function all() {
 
         return $this->queryDocs(
-        "SELECT DISTINCT ?uri ?doc ?title ?issued ?modified".
+        "SELECT DISTINCT ?uri ?doc ?title ?issued ?modified ?lang".
         "    WHERE {".
         "        GRAPH ?uri { ?doc a <http://www.europeana.eu/schemas/edm/ProvidedCHO>.".
         "        ?doc <http://purl.org/dc/elements/1.1/title> ?title.".
+        "        OPTIONAL {?doc <http://purl.org/dc/elements/1.1/language> ?lang.} ".
         "        OPTIONAL {?doc <http://purl.org/dc/terms/issued> ?issued.} ".
         "        OPTIONAL {?doc <http://purl.org/dc/terms/modified> ?modified.} }".
         "    } ORDER BY ?uri"
@@ -79,7 +83,8 @@
             return null;
         }
 
-        return new Document($docUri, $doc);
+        // clone the graph to force the URI
+        return new Document($docUri, new Graph($docUri, $doc->toRdfPhp()));
 
     }
 
@@ -143,10 +148,11 @@
         $offset = max(0,($page - 1) * $perPage);
 
         $query =
-            "SELECT DISTINCT ?uri ?doc ?title ?issued ?modified".
+            "SELECT DISTINCT ?uri ?doc ?title ?issued ?modified ?lang".
             "    WHERE {".
             "        GRAPH ?uri { ?doc a <http://www.europeana.eu/schemas/edm/ProvidedCHO>.".
             "        ?doc <http://purl.org/dc/elements/1.1/title> ?title.".
+            "        OPTIONAL {?doc <http://purl.org/dc/elements/1.1/language> ?lang.} ".
             "        OPTIONAL {?doc <http://purl.org/dc/terms/issued> ?issued.} ".
             "        OPTIONAL {?doc <http://purl.org/dc/terms/modified> ?modified.} }".
             "    } ORDER BY ?uri OFFSET $offset LIMIT $perPage";