I think I finally understand
#RDFstar enough to opine the limited subset
#RDFprotostar should be enough for most of all use cases:
https://github.com/w3c/rdf-star/issues/277
Subset of RDF-star without recursion · Issue #277 · w3c/rdf-star
Specification of RDF-protostar An RDF-protostar triple is a 3-tuple defined as follows: any RDF triple is an RDF-protostar triple; if t and t' are RDF triples, s is an IRI or a blank node, p is...
Jakob Voß