rdflib: RDFlib makes invalid Turtle cURIs

Some cURIs cannot be parsed with RDFlib, even those produced by RDFlib.

For example:

If we have the following RDF/TURTLE:

@prefix ex: <https://example.org/term#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
@prefix dbr: <http://dbpedia.org/resource/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

<http://example.org/entity> ex:anchorOf "This press"^^xsd:string ;
            a <http://dbpedia.org/resource/This_(journal)> .

We load the TTL using g.parse(data=ttl) and we serialize it with g.serialize() we get:

@prefix dbr: <http://dbpedia.org/resource/> .
@prefix ex: <https://example.org/term#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<http://example.org/entity> a dbr:This_(journal) ;
    ex:anchorOf "This press"^^xsd:string .

Then, if we load the output again with g.parse(data=ttl, format="turtle"), we get the following errorr:

rdflib.plugins.parsers.notation3.BadSyntax: at line 5 of <>: Bad syntax (expected ‘.’ or ‘}’ or ‘]’ at end of statement) at ^ in: “…b’/2001/XMLSchema#> .\n\nhttp://example.org/entity a dbr:This_‘^b’(journal) ;\n ex:anchorOf “This press”^^xsd:string .'”

The error is cause by dbr:This_(journal), more presicely by the ‘(’ and ‘)’. It seems RDFlib does not like its own output.

Any ideas on what may be happing here?