In the rdf to-jelly command, for the vast majority of input formats it is impossible to pass generalized RDF data, as the Jena parsers will refuse to parse it.

The only formats that can have generalized statements and be parsed are:

• jena-thrift
• jena-protobuf
• jelly-text
• jelly (though I don't think it's supported in this command at the moment)

For Jelly inputs, we should copy the original settings anyway.

For Jena Thrift/Protobuf, we can set the generalized RDF flag to true. In all other cases – set it to false.