I would expect to be able to round-trip quads with rdfpipe, but this does not work because rdfpipe labels quads in the default graph with a graph name and then serializes them with the injected graph name.
~/sw/d/github.com/iafork/rdflib.cleanish $ cat ./test/w3c/trig/trig-turtle-03.trig # Turtle is TriG prefix : <http://example/> [ :p 123 ; :q 456 ] :r 1 .
~/sw/d/github.com/iafork/rdflib.cleanish $ pipx run --spec git+https://github.com/RDFLib/rdflib.git@master#egg=rdflib rdfpipe -i trig -o nquads ./test/w3c/trig/trig-turtle-03.trig _:n33872095eabf41d58f85dc3a7c672883b1 <http://example/p> "123"^^<http://www.w3.org/2001/XMLSchema#integer> <file:///home/iwana/sw/d/github.com/iafork/rdflib.cleanish/test/w3c/trig/trig-turtle-03.trig> . _:n33872095eabf41d58f85dc3a7c672883b1 <http://example/q> "456"^^<http://www.w3.org/2001/XMLSchema#integer> <file:///home/iwana/sw/d/github.com/iafork/rdflib.cleanish/test/w3c/trig/trig-turtle-03.trig> . _:n33872095eabf41d58f85dc3a7c672883b1 <http://example/r> "1"^^<http://www.w3.org/2001/XMLSchema#integer> <file:///home/iwana/sw/d/github.com/iafork/rdflib.cleanish/test/w3c/trig/trig-turtle-03.trig> .
~/sw/d/github.com/iafork/rdflib.cleanish
$ pipx run --spec git+https://github.com/RDFLib/rdflib.git@master#egg=rdflib rdfpipe -i trig -o nquads ./test/w3c/trig/trig-turtle-03.trig | pipx run --spec git+https://github.com/RDFLib/rdflib.git@master#egg=rdflib rdfpipe -i nquads -o trig -
@prefix ns1: <file:///home/iwana/sw/d/github.com/iafork/rdflib.cleanish/test/w3c/trig/> .
@prefix ns2: <http://example/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
ns1:trig-turtle-03.trig {
[] ns2:p 123 ;
ns2:q 456 ;
ns2:r 1 .
}
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