Thanks @alabaeye for this quick answer.
Alas the project underneath ldp.virtual-assembly.org:9000 ,
which is : semantic_forms
https://github.com/jmvanel/semantic_forms/blob/master/scala/forms_play/README.md
has more ambitions than documentation, and video and white paper lack badly !
But there are the links on bottom of page that you saw maybe:
User Manual
Manuel utilisateur
To compare with what you know, Semantic MediaWiki,
both allow to create Linked Data ( RDF ),
but semantic_forms fully leverages on existing ontologies and vocabularies ( same thing ! ) and SPARQL database standard from the W3C,
while AFAIK Semantic MediaWiki is wiki centered, forms must be defined in a specific way, and no complex queries are possible.
Also I’m not sure whether Semantic Media Wiki can import any RDF content .