Felipe Schenone, 06/09/19 02:11:
It's basically a
template<https://es.wikipedia.org/wiki/Plantilla:Extracto>
that transcludes the introduction (or any section) of an article into
another article.
Thank you. I do like content transclusion; it's used most often in
Wikibooks and Wikisource I'd say. On the (English) Wikipedia, most talk
about content transclusion has revolved around portals (how to make sure
they add value and remain fresh without having an enormous maintenance
cost).
Federico