I’m wondering if anybody knows about GUI-based tools that support managing RDF* graphs. A bit like how you manage your ontologies in Protégé. Or does Protégé itself support RDF* as well? (Did not find this yet)
Gra.fo (https://gra.fo/) supports adding properties on edges.
You can export it into some Property graph formats. However, there is no official Property Graph schema language (yet).
RDF* is just the data model, there is no extension for RDF Schema or OWL (yet). That means there is no established way to export a properties on edges for RDF.
(Disclaimer: I am one of the creators of Gra.fo)
Thanks! I’ll definitely check this out