Contains the previous sibling of the node in the parent's child list.
var objXMLDOMNode = oXMLDOMNode.previousSibling;
The following script example creates an IXMLDOMNode object and sets it to the previous sibling of the current node.
var xmlDoc = new ActiveXObject("Msxml2.DOMDocument.5.0");
var currNode;
var prevNode;
xmlDoc.async = false;
xmlDoc.load("books.xml");
if (xmlDoc.parseError.errorCode <> 0) {
   var myErr = xmlDoc.parseError;
   alert("You have error " + myErr.reason);
} else {
   currNode = xmlDoc.documentElement.childNodes.item(1);
   prevNode = currNode.previousSibling;
   alert(prevNode.xml);
}
Set objXMLDOMNode = oXMLDOMNode.previousSibling
The following Microsoft® Visual Basic® example creates an IXMLDOMNode object and sets it to the previous sibling of the current node.
Dim xmlDoc As New Msxml2.DOMDocument50
Dim currNode As IXMLDOMNode
Dim prevNode As IXMLDOMNode
xmlDoc.async = False
xmlDoc.Load ("books.xml")
If (xmlDoc.parseError.errorCode <> 0) Then
   Dim myErr
   Set myErr = xmlDoc.parseError
   MsgBox("You have error " & myErr.reason)
Else
   Set currNode = xmlDoc.documentElement.childNodes.Item(1)
   Set prevNode = currNode.previousSibling
   MsgBox prevNode.xml
End If
HRESULT get_previousSibling(
    IXMLDOMNode **previousSibling);
previousSibling parameter is Null.The property is read-only.
This value depends on the value of the nodeType property.
| NODE_ATTRIBUTE
 NODE_DOCUMENT NODE_DOCUMENT_FRAGMENT  | 
Always returns Null; these node types do not appear as children of any other nodes. | 
| NODE_CDATA_SECTION
 NODE_COMMENT NODE_DOCUMENT_TYPE NODE_ELEMENT NODE_ENTITY NODE_ENTITY_REFERENCE NODE_NOTATION NODE_PROCESSING_INSTRUCTION NODE_TEXT  | 
Returns the node immediately preceding this node in its parent's child list. Returns Null if no such node exists. | 
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Applies to: IXMLDOMAttribute | IXMLDOMCDATASection | IXMLDOMCharacterData | IXMLDOMComment | DOMDocument | IXMLDOMDocumentFragment | IXMLDOMDocumentType | IXMLDOMElement | IXMLDOMEntity | IXMLDOMEntityReference | IXMLDOMNode | IXMLDOMNotation | IXMLDOMProcessingInstruction | IXMLDOMText