EDIT

/**

 * @param $name_rel

 * @return string

 */

function name_relationship_footnote_markup($name_rel)

{

  $footnote_markup = '';

  $footnote_key_markup = '';

  if (isset($name_rel->ruleConsidered) && $name_rel->ruleConsidered) {

    $footnote_markup = '<span class="rule_considered">' . $name_rel->ruleConsidered . '</span> ';

  }

  if (isset($name_rel->citation)) {

    $footnote_markup .= '<span class="reference">' . $name_rel->citation->titleCache . '</span>';

  }

  if (isset($name_rel->citationMicroReference) && $name_rel->citationMicroReference) {

    $footnote_markup .= (isset($name_rel->citation) ? ':' : '') . ' <span class="reference_detail">' . $name_rel->citationMicroReference . '</span>';

  }

  if ($footnote_markup) {

    $fnkey = FootnoteManager::addNewFootnote(RenderHints::getFootnoteListKey(), $footnote_markup);

    $footnote_key_markup = render_footnote_key($fnkey,',',TRUE);

  }

  return $footnote_key_markup;

}