code: def _html_output(self, normal_row, error_row, row_ender,  help_text_html, errors_on_separate_row):
          
          parts = []
          parts.append(super(XmlObjectForm, self)._html_output(normal_row, error_row, row_ender,
                  help_text_html, errors_on_separate_row))
  
          def _subform_output(subform):
              return subform._html_output(normal_row, error_row, row_ender,
                                          help_text_html, errors_on_separate_row)
  
          for name, subform in six.iteritems(self.subforms):
              # use form label if one was set
              if hasattr(subform, 'form_label'):
                  name = subform.form_label
              parts.append(self._html_subform_output(subform, name, _subform_output))
  
          for name, formset in six.iteritems(self.formsets):
              parts.append(u(formset.management_form))
              # use form label if one was set
              # - use declared subform label if any
              if hasattr(formset.forms[0], 'form_label') and \
                      formset.forms[0].form_label is not None:
                   name = formset.forms[0].form_label
              # fallback to generated label from field name
              elif hasattr(formset, 'form_label'):
                  name = formset.form_label
  
              # collect the html output for all the forms in the formset
              subform_parts = list()
  
              for subform in formset.forms:
                  subform_parts.append(self._html_subform_output(subform,
                                        gen_html=_subform_output, suppress_section=True))
              # then wrap all forms in the section container, so formset label appears once
              parts.append(self._html_subform_output(name=name, content=u'\n'.join(subform_parts)))
  
          return mark_safe(u'\n'.join(parts))
docs: Extend BaseForm's helper function for outputting HTML. Used by as_table(), as_ul(), as_p().
  
          Combines the HTML version of the main form's fields with the HTML content
          for any subforms.