Performance improvements
diff --git a/src/test/resources/queries/cosmas4.json b/src/test/resources/queries/cosmas4.json
index 2040995..2dff321 100644
--- a/src/test/resources/queries/cosmas4.json
+++ b/src/test/resources/queries/cosmas4.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",
@@ -37,4 +37,4 @@
       }
     } ]
   }
-}
\ No newline at end of file
+}