--- a/common/lang-jsonld.js	Mon Feb 18 14:00:52 2013 +0100
+++ b/common/lang-jsonld.js	Mon Feb 18 15:44:20 2013 +0100
@@ -55,7 +55,7 @@
     ],
     [
       // common "keywords"
-      ["lang-jsonld-keyword", /^"(@context|@id|@value|@language|@type|@container|@list|@set|@vocab|@graph)"\s*:/],
+      ["lang-jsonld-keyword", /^"(@context|@id|@value|@language|@type|@container|@list|@set|@vocab|@graph|@index)"\s*:/],
       // empty string
       //[PR.PR_LITERAL, /^""/],
       ["lang-jsonld-string", /^""/],