When syndicating the content of another site, the |afficher_tags filter is applied to the #TAGS filter and will display either the syndicated article’s:
tags/keywords: [(#TAGS|afficher_tags{tag})],
section/category: [(#TAGS|afficher_tags{directory})],
attached documents/podcast: [(#TAGS|afficher_tags{enclosure})].
(By default, [(#TAGS|afficher_tags)] is equivalent to [(#TAGS|afficher_tags{'tag, directory'})].)
For more detailed information see the article about Content Syndication