Resolve relative URIs

[renyuneyun]

So, I'm trying to parse a Solid WebID Profile document, which contains many relative URLs (e.g. #me).
The current rdflib implementation does not resolve it to absolute URIs during querying, resulting in empty results if I do the following:

graph.objects(sub: URIRef('https://url.to/profile/card#me'));

It would be best to allow them to be resolved, such as supporting manually setting @base, or allow setting a parameter during parsing. E.g. This is supported in Python's rdflib.