--- a/playground/jsonld.js	Fri Mar 01 11:22:11 2013 -0500
+++ b/playground/jsonld.js	Mon Mar 04 21:28:43 2013 -0500
@@ -4832,6 +4832,7 @@
     return false;
   }
   switch(v) {
+  case '@base':
   case '@context':
   case '@container':
   case '@default':