diff --git a/Lib/xml/dom/minidom.py b/Lib/xml/dom/minidom.py
index 5fd3911bd3c9eb..57675946f38d1b 100644
--- a/Lib/xml/dom/minidom.py
+++ b/Lib/xml/dom/minidom.py
@@ -38,6 +38,7 @@ class Node(xml.dom.Node):
     ownerDocument = None
     nextSibling = None
     previousSibling = None
+    nodeValue = None
 
     prefix = EMPTY_PREFIX # non-null only for NS elements and attributes
 
@@ -366,9 +367,7 @@ def _get_elements_by_tagName_ns_helper(parent, nsURI, localName, rc):
 class DocumentFragment(Node):
     nodeType = Node.DOCUMENT_FRAGMENT_NODE
     nodeName = "#document-fragment"
-    nodeValue = None
     attributes = None
-    parentNode = None
     _child_node_types = (Node.ELEMENT_NODE,
                          Node.TEXT_NODE,
                          Node.CDATA_SECTION_NODE,
@@ -711,7 +710,6 @@ class Element(Node):
                'namespaceURI', '_localName', 'childNodes', '_attrs', '_attrsNS',
                'nextSibling', 'previousSibling')
     nodeType = Node.ELEMENT_NODE
-    nodeValue = None
     schemaType = _no_type
 
     _magic_id_nodes = 0
@@ -1353,7 +1351,6 @@ def _get_systemId(self):
 
 class DocumentType(Identified, Childless, Node):
     nodeType = Node.DOCUMENT_TYPE_NODE
-    nodeValue = None
     name = None
     publicId = None
     systemId = None
@@ -1414,7 +1411,6 @@ def writexml(self, writer, indent="", addindent="", newl=""):
 class Entity(Identified, Node):
     attributes = None
     nodeType = Node.ENTITY_NODE
-    nodeValue = None
 
     actualEncoding = None
     encoding = None
@@ -1492,7 +1488,6 @@ def writexml(self, writer, indent="", addindent="", newl=""):
 
 class Notation(Identified, Childless, Node):
     nodeType = Node.NOTATION_NODE
-    nodeValue = None
 
     def __init__(self, name, publicId, systemId):
         self.nodeName = name
@@ -1638,10 +1633,7 @@ class Document(Node, DocumentLS):
     implementation = DOMImplementation()
     nodeType = Node.DOCUMENT_NODE
     nodeName = "#document"
-    nodeValue = None
     attributes = None
-    parentNode = None
-    previousSibling = nextSibling = None
 
 
     # Document attributes from Level 3 (WD 9 April 2002)