Performance improvements
diff --git a/src/test/resources/queries/cosmas4b.json b/src/test/resources/queries/cosmas4b.json
index 8fe2344..4b44753 100644
--- a/src/test/resources/queries/cosmas4b.json
+++ b/src/test/resources/queries/cosmas4b.json
@@ -1,5 +1,5 @@
 {
-  "context" : "http://ids-mannheim.de/ns/KorAP/json-ld/v0.1/context.jsonld",
+  "@context" : "http://ids-mannheim.de/ns/KorAP/json-ld/v0.1/context.jsonld",
   "query" : {
     "@type" : "korap:group",
     "operation" : "operation:sequence",