--- a/common/lang-jsonld.js	Thu Feb 28 16:02:56 2013 -0500
+++ b/common/lang-jsonld.js	Thu Feb 28 16:12:18 2013 -0500
@@ -55,7 +55,7 @@
     ],
     [
       // common "keywords"
-      ["lang-jsonld-keyword", /^"(@context|@id|@value|@language|@type|@container|@list|@set|@vocab|@graph|@index)"\s*:/],
+      ["lang-jsonld-keyword", /^"(@context|@id|@value|@language|@type|@container|@list|@set|@base|@vocab|@graph|@index)"\s*:/],
       // empty string
       //[PR.PR_LITERAL, /^""/],
       ["lang-jsonld-string", /^""/],