diff --git a/lib/query/woqlCore.js b/lib/query/woqlCore.js
index 13cb87fa..6ad824e9 100644
--- a/lib/query/woqlCore.js
+++ b/lib/query/woqlCore.js
@@ -1,43 +1,7 @@
 ////@ts-check
 const UTILS = require('../utils')
 const WOQLPrinter = require('./woqlPrinter')
-
-
-function  convert(obj){
-    if (obj == null){
-        return null
-    } else if (typeof(obj) == 'number'){
-        return { '@type' : 'Value',
-                 'data' : { '@type' : 'xsd:decimal',
-                            '@value' : obj }}
-    } else if (typeof(obj) == 'boolean'){
-        return { '@type' : 'Value',
-                 'data' : { '@type' : 'xsd:boolean',
-                            '@value' : obj }}
-    } else if (typeof(obj) == 'str'){
-        return { '@type' : 'Value',
-                 'data' : { '@type' : 'xsd:string',
-                            '@value' : obj }}
-    } else if (typeof(obj) == 'object'){
-        var pairs = []
-        for (const [key, value] of Object.entries(obj)) {
-            pairs.push({ '@type' : 'FieldValuePair',
-                         'field' : key,
-                         'value' : convert(value) })
-        }
-        return { '@type' : 'DictionaryTemplate',
-                 'data' : pairs }
-    }
-}
-
-export function Var(name){
-        this.name = name
-}
-
-export function Doc(obj) {
-        this.doc = obj
-        this.encoded = convert(obj)
-}
+const {Var, Doc} = require('./woqlDoc')
 
 /**
  * defines the internal functions of the woql query object - the language API is defined in WOQLQuery
diff --git a/lib/query/woqlDoc.js b/lib/query/woqlDoc.js
new file mode 100644
index 00000000..944c6ae7
--- /dev/null
+++ b/lib/query/woqlDoc.js
@@ -0,0 +1,36 @@
+function  convert(obj){
+    if (obj == null){
+        return null
+    } else if (typeof(obj) == 'number'){
+        return { '@type' : 'Value',
+                 'data' : { '@type' : 'xsd:decimal',
+                            '@value' : obj }}
+    } else if (typeof(obj) == 'boolean'){
+        return { '@type' : 'Value',
+                 'data' : { '@type' : 'xsd:boolean',
+                            '@value' : obj }}
+    } else if (typeof(obj) == 'str'){
+        return { '@type' : 'Value',
+                 'data' : { '@type' : 'xsd:string',
+                            '@value' : obj }}
+    } else if (typeof(obj) == 'object'){
+        var pairs = []
+        for (const [key, value] of Object.entries(obj)) {
+            pairs.push({ '@type' : 'FieldValuePair',
+                         'field' : key,
+                         'value' : convert(value) })
+        }
+        return { '@type' : 'DictionaryTemplate',
+                 'data' : pairs }
+    }
+}
+
+function Var(name){
+        this.name = name
+}
+
+function Doc(obj) {
+        this.doc = obj
+        this.encoded = convert(obj)
+}
+module.exports = {Var,Doc}
\ No newline at end of file
diff --git a/lib/woql.js b/lib/woql.js
index ba6f64ea..a3d36e8f 100644
--- a/lib/woql.js
+++ b/lib/woql.js
@@ -2,7 +2,7 @@
 //I HAVE TO REVIEW THE Inheritance and the prototype chain
 const typedef = require('./typedef')
 const WOQLQuery = require('./query/woqlBuilder')
-const {Var} = require("./query/woqlCore")
+const {Var} = require("./query/woqlDoc")
 /**
  * @license Apache Version 2
  * @module WOQL
diff --git a/test/woql.spec.js b/test/woql.spec.js
index 4814c4bf..3ceb77c5 100644
--- a/test/woql.spec.js
+++ b/test/woql.spec.js
@@ -1,6 +1,7 @@
 const expect = require('chai').expect;
 
 var WOQL = require('../lib/woql');
+var {Var} = require('../lib/query/woqlDoc');
 
 const idGenJson = require('./woqlJson/woqlIdgenJson');
 const woqlStarJson = require('./woqlJson/woqlStarJson');
@@ -417,4 +418,10 @@ describe('woql queries', function () {
     expect(woqlObject.json()).to.eql(woqlJson.deleteDocJson);
   })
 
+
+  it('check the vars method',function(){
+    const varsArr=WOQL.vars("A","B","C");
+
+    expect(varsArr[0]).to.be.instanceof(Var);
+  })
 })