:return: dict
            """
            root = STSElement.fromstring(
                'AssumeRoleWithClientGrantsResponse', data)
            result = root.find('AssumeRoleWithClientGrantsResult')
            creds = result.find('Credentials')
            return dict(
                access_key=creds.get_child_text('AccessKeyId'),
                secret_key=creds.get_child_text('SecretAccessKey'),