Maybe it's useful to split out B1) KG pipelines from the choice of B2) simple property graph ontologies & queries vs advanced rdf ontologies and sparql queries
It sounds like you are thinking about KG pipelines, but I'm unclear on whether typed property graphs, vs more advanced RDF/SPARQL, is needed in your view on the graph engine side?
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Maybe it's useful to split out B1) KG pipelines from the choice of B2) simple property graph ontologies & queries vs advanced rdf ontologies and sparql queries
It sounds like you are thinking about KG pipelines, but I'm unclear on whether typed property graphs, vs more advanced RDF/SPARQL, is needed in your view on the graph engine side?