getElementsByTagName() does not work with DomDocument60

Hi,

getElementsByTagName() works with DomDocument, but it does not work with DomDocument60.

In the below snippet, getElementsByTagName(_bstr_t(".//author"), &xml2); return a NULL pointer in xml2.

When i change from DomDocument60 to DomDocument, only then it works. i need to use DomDocument60 in my project.

Any idea how this issue can be fixed, if i use DomDocument60. Any help is appreciated.
Below is the snippet:

#include "stdafx.h"

#import "msxml6.dll" raw_interfaces_only  raw_native_types 
using namespace MSXML2;

#include "stdlib.h"
#include "stdio.h"
#include <string>
#include <list>
using namespace std;

void LoadXML()
{
	HRESULT hr1, hr;
	hr1 = CoInitialize(NULL); 
	_variant_t vaNodeVal("c://Data.xml");
	
	VARIANT var1 = vaNodeVal;
	CComPtr<IXMLDOMDocument2> sSourceInputXml = 0;
	hr = sSourceInputXml.CoCreateInstance(__uuidof(MSXML2::DOMDocument60));

	if (hr == S_OK && sSourceInputXml != NULL)
	{
		VARIANT_BOOL isSuccessful = VARIANT_FALSE;

		hr = sSourceInputXml->load(var1, &isSuccessful);

		if( hr == S_OK && isSuccessful == VARIANT_TRUE )
		{

			CComQIPtr<MSXML2::IXMLDOMNodeList> xml2;
			sSourceInputXml->getElementsByTagName(_bstr_t(".//author"), &xml2); //xml2 returned over here is NULL 

			long lCount = 0;
			xml2->get_length(&lCount);
			bool isPresent = false;
			if (lCount == 0)
			{
				isPresent = false;
			}
			else
			{
				isPresent = true;
			}
		}
	}


	CoUninitialize();  
}

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Data.xml used is:

<?xml version="1.0"?>
<catalog>
   <book id="bk101">
      <author>Gambardella, Matthew</author>
      <title>XML Developer's Guide</title>
      <genre>Computer</genre>
      <price>44.95</price>
      <publish_date>2000-10-01</publish_date>
      <description>An in-depth look at creating applications 
      with XML.</description>
   </book>
   <book id="bk102">
      <author>Ralls, Kim</author>
      <title>Midnight Rain</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-12-16</publish_date>
      <description>A former architect battles corporate zombies, 
      an evil sorceress, and her own childhood to become queen 
      of the world.</description>
   </book>
   <book id="bk103">
      <author>Corets, Eva</author>
      <title>Maeve Ascendant</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-11-17</publish_date>
      <description>After the collapse of a nanotechnology 
      society in England, the young survivors lay the 
      foundation for a new society.</description>
   </book>
</catalog>

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