NS_NOTYETIMPLEMENTED("nsDocumentFragment::IsDefaultNamespace()");  return NS_ERROR_NOT_IMPLEMENTED;
*aReturn = PR_FALSE; return NS_OK;
nsDocumentFragment::IsDefaultNamespace(const nsAString& aNamespaceURI,                                       PRBool* aReturn){  NS_NOTYETIMPLEMENTED("nsDocumentFragment::IsDefaultNamespace()");  return NS_ERROR_NOT_IMPLEMENTED;}