--- a/playground/playground-examples.js	Thu Aug 04 19:33:13 2011 -0400
+++ b/playground/playground-examples.js	Thu Aug 04 19:53:54 2011 -0400
@@ -185,7 +185,8 @@
             "xsd:anyURI": "ex:contains"
          },
          "dc": "http://purl.org/dc/elements/1.1/",
-         "ex": "http://example.org/vocab#"
+         "ex": "http://example.org/vocab#",
+         "xsd": "http://www.w3.org/2001/XMLSchema#"
       }
    };