Added string value helper for virtual collections
diff --git a/dev/js/src/vc/doc.js b/dev/js/src/vc/doc.js
index a19430a..23cec07 100644
--- a/dev/js/src/vc/doc.js
+++ b/dev/js/src/vc/doc.js
@@ -5,8 +5,9 @@
 define([
   'vc/jsonld',
   'vc/rewritelist',
+  'vc/stringval',
   'util'
-], function (jsonldClass, rewriteListClass) {
+], function (jsonldClass, rewriteListClass, stringValClass) {
 
     /*
       var fieldMenu = menuClass.create([