RDF* data insert error

when insert data into stardog, this does work:
<<:bob :meet :susan>> :venue :NewYork;
:date "2020-10-12" .

but this is invalid and don't work in stardog:
<<:jane :told :susan>> :about <<:bob :love :susan>>;
:date "2021-06-15" .

But both of the above are valid rdf* statement, and do work in other graph databases as graphdb. Does anyone know why the latter got error?
in addition, a suggestion: Can stardog support SVG format when exporting Visual graphs?


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