aPublicId, aSystemId, nsAutoString());
aPublicId, aSystemId, nsString());
nsDOMImplementation::CreateDocumentType(const nsString& aQualifiedName,                                        const nsString& aPublicId,                                         const nsString& aSystemId,                                         nsIDOMDocumentType** aReturn){  NS_ENSURE_ARG_POINTER(aReturn);  return NS_NewDOMDocumentType(aReturn, aQualifiedName, nsnull, nsnull,                               aPublicId, aSystemId, nsAutoString());}