code: def get_subject(self, identifier):
          
          subject = etree.Element('Subject')
          name = etree.SubElement(subject, 'NameIdentifier')
          name.text = identifier
          subject_confirmation = etree.SubElement(subject, 'SubjectConfirmation')
          method = etree.SubElement(subject_confirmation, 'ConfirmationMethod')
          method.text = self.confirmation_method
          return subject
docs: Build a Subject XML block for a SAML 1.1
          AuthenticationStatement or AttributeStatement.