return mRoot->QueryInterface(kIDOMDocumentFragmentIID, (void**)aFragment);
return mRoot->QueryInterface(NS_GET_IID(nsIDOMDocumentFragment), (void**)aFragment);
nsHTMLFragmentContentSink::GetFragment(nsIDOMDocumentFragment** aFragment){  if (nsnull != mRoot) {    return mRoot->QueryInterface(kIDOMDocumentFragmentIID, (void**)aFragment);  }  else {    *aFragment = nsnull;    return NS_OK;  }}