diff --git a/src/ol/xml.js b/src/ol/xml.js
index 7549ff7bad..160bac74f5 100644
--- a/src/ol/xml.js
+++ b/src/ol/xml.js
@@ -91,32 +91,13 @@ ol.xml.getAllTextContent_ = function(node, normalizeWhitespace, accumulator) {
 
 /**
  * @param {?} value Value.
- * @private
  * @return {boolean} Is document.
  */
-ol.xml.isDocument_ = function(value) {
+ol.xml.isDocument = function(value) {
   return value instanceof Document;
 };
 
 
-/**
- * @param {?} value Value.
- * @private
- * @return {boolean} Is document.
- */
-ol.xml.isDocumentIE_ = function(value) {
-  return goog.isObject(value) && value.nodeType == goog.dom.NodeType.DOCUMENT;
-};
-
-
-/**
- * @param {?} value Value.
- * @return {boolean} Is document.
- */
-ol.xml.isDocument = goog.userAgent.IE ?
-    ol.xml.isDocumentIE_ : ol.xml.isDocument_;
-
-
 /**
  * @param {?} value Value.
  * @private