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