EDIT

/**

 * Creates the footnotes for the given CDM DescriptionElement instance.

 *

 * Footnotes are created for annotations and original sources,

 * optionally the sources are put into a separate bibliography.

 *

 * @param $descriptionElement

 *   A CDM DescriptionElement instance

 * @param $separator

 *   Optional parameter. The separator string to concatenate the footnote ids, default is ','

 * @param $footnote_list_key_suggestion string

 *    This paramter will be overridden for original sources if the bibliography block is enabled.

 *    optional parameter. If this paramter is left empty (null, 0, "") the footnote key will be determined by the nested

 *    method calls by calling RenderHints::getFootnoteListKey(). NOTE: the footnore key for annotations will be set to

 *    RenderHints::getFootnoteListKey().'-annotations'. @see cdm_annotations_as_footnotekeys()

 *

 * @return String

 *   The foot note keys

 */

function cdm_create_description_element_footnotes(

          $description_element,

          $separator = ',',

          $footnote_list_key_suggestion = null,

          $do_link_to_reference = FALSE,

          $do_link_to_name_used_in_source = FALSE

    )

{

  return cdm_create_footnotes($description_element,

    $separator,

    $footnote_list_key_suggestion,

    $do_link_to_reference,

    $do_link_to_name_used_in_source,

    true

  );

}

    // sources as footnotes or put into into bibliography if requested ...

      if(empty($config['bibliography_aware'])) {

          $config['link_to_name_used_in_source'] == 1

        );

      } else {

        $annotations_and_sources['foot_note_keys'] = cdm_create_description_element_footnotes(

          $entity, ',',

          $footnote_list_key_suggestion,

          $config['link_to_reference'] == 1,

          $config['link_to_name_used_in_source'] == 1

      }