Merge pull request #264 from terminusdb/add_method_to_Var

This may fix arithmetic operations

Author: Francesca-Bit

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,
+    };
+  };
 }
 
 /**