This may fix arithmetic operations

Need to discuss this with Francesca

Author: GavinMendelGleason

lib/query/woqlDoc.js

@@ -72,6 +72,12 @@ function convert(obj) {
  */
 function Var(name) {
   this.name = name;
+  this.json = function () {
+    return {
+      '@type' : 'Value',
+      variable : this.name
+    }
+  }
 }
 
 /**