Update to latest jsonld.js.
--- a/playground/jsonld.js Thu Feb 14 12:40:58 2013 -0500
+++ b/playground/jsonld.js Thu Feb 14 12:41:30 2013 -0500
@@ -3709,7 +3709,7 @@
// options for the value of @type or @language
var options;
- // determine options for @id based on whether or not it compacts to a term
+ // determine options for @id based on whether or not value compacts to a term
if(typeOrLanguageValue === '@id' && _isSubjectReference(value)) {
// try to compact value to a term
var term = _compactIri(