EDIT

  $sources = cdm_entity_sources_sorted($cdm_entity);

  // Annotations as footnotes.

  $footnote_keys = cdm_entity_annotations_as_footnote_keys($cdm_entity, $footnote_list_key_suggestion);

    $original_source_footnote_tag = $bibliography_settings['enabled'] == 1 ? 'div' : null; // null will cause bibliography_footnote_list_key to use the default

  } else {

    $sources_footnote_list_key = $footnote_list_key_suggestion;

    $original_source_footnote_tag = NULL;

  }

    return '';

  }

  $out = '<' . $element_tag . ' class="footnotes footnotes-' . $footnote_list_key . ' ">'

    . FootnoteManager::renderFootnoteList($footnote_list_key)

    . '</' . $element_tag . '>';