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    Iwan Aucamp
    @aucampia
    Always glad to have more people using it :)
    Another great place to ask for help in general is https://gitter.im/linkeddata/chat - but that is just general semantic web and not rdflib specific
    joylix
    @joylix
    Does rdflib support RDF-star and SPARQL-star now?
    Iwan Aucamp
    @aucampia
    @joylix not yet AFAIK see RDFLib/rdflib#955
    Avy Faingezicht
    @avyfain
    Is there a way to set up a default language for a graph, just like there's the default context?
    Iwan Aucamp
    @aucampia
    Like the default language for string literals?
    I don't think there is a built in way to do that
    Avy Faingezicht
    @avyfain
    Hmm bummer. Yeah, that's what I was thinking. Partly because if they are null they aren't unique when using the sqlalchemy backend.
    rpgoldman
    @rpgoldman
    Is there a way to add a prefix definition for : in RDFLib? g.bind("", ns) does not seem to work.
    When I normalize a URI with that binding, I get default1:foobar for :foobar
    Avy Faingezicht
    @avyfain
    Anyone here has experience working with large datasets in rdflib-sqlalchemy with psql as a backend? any advice on reducing latencies at read/write time?
    Iwan Aucamp
    @aucampia
    I have not used it, but I guess the best advice I can give is to try and isolate where the latency is coming from
    2 replies
    rpgoldman
    @rpgoldman
    Wanted to ask a question about rdflab.extras.infixowl : I don't see how to enter a datatype restriction (e.g., the numericalUnit only owl:real [>= 200 ] Anyone know if this is possible?
    2 replies
    Iwan Aucamp
    @aucampia
    Hope Nick knows we appreciate all the work he puts into this
    Can imagine it must feel a bit thankless
    But I think it is invaluable
    white_gecko
    @white_gecko:matrix.org
    [m]
    I have forwarded it to him.
    Iwan Aucamp
    @aucampia
    thanks :)
    white_gecko
    @white_gecko:matrix.org
    [m]
    Thank you, for giving room to such important things in live :-)
    Iwan Aucamp
    @aucampia
    If anyone has time for a review: RDFLib/rdflib#1452 - Migrate from nosetest to pytest
    Iwan Aucamp
    @aucampia
    Need more reviewers :/
    Robert Alexander
    @rjalexa
    Dear friends, medical doctor here trying to model human medicines. I generate a .ttl file which works well but I need to add the following line manually everytime: http://isagog.com/dataset/aifa rdf:type owl:Ontology ;
    owl:imports http://isagog.com/ontologies/pharma .
    Is there a way to use RDFLib in such a way that it will add that when serializing/writing the file? Thank you so much for this wonderful package.
    Robert Alexander
    @rjalexa
    Nevermind, I overcame my brain freeze and found the solution :) Thanks to you all
    Graham Higgins
    @gjhiggins
    2 replies
    greattang123
    @greattang123

    Dear rdflib manitainers,
    I am a user of rdflib. When I use rdflib.Graph to parse one .nt file, the terminal output is
    rdflib.exceptions.ParserError: Invalid line: http://dbpedia.org/resource/2015_African_Rugby_Under-19_Cup_Division_"A" .
    While I remove the double quotations of ”A", i.e., "A" -> A,the program is OK. I want to know if there are other ways to parsing the .nt file rather than remove the double quotations of ”A".
    Thanks a lot.
    Yours Sincerely.

    Appendix
    Data{ <a:> http://www.w3.org/2002/07/owl#sameAs http://dbpedia.org/resource/2015_African_Rugby_Under-19_Cup_Division_"A" .}
    Code{
    from rdflib import Graph
    g = Graph()
    g.parse("./data/example.nt")
    print(f"Graph g has {len(g)} statements.")
    print(g.serialize(format="turtle"))
    }

    Graham Higgins
    @gjhiggins
    Looks like a problematic URL for dbpedia. With, or without the double qutoes, that dbpedia URL returns a “301 See other” and the relocate is https://dbpedia.org/resource/2015_African_Rugby_Under-19_Cup_Division_%22A%22- which itself fails to resolve. OTOH, wikipedia returns a corresponding redirect https://en.wikipedia.org/wiki/2015_African_Rugby_Under-19_Cup_Division_%22A%22 which is found. The dbpedia page is essentially blank, it has none of the info for that entry on wikipedia.
    1 reply
    Iwan Aucamp
    @aucampia
    @greattang123 I once had similar issues, and then what I did was basically to run urllib.parse.quoteon the bad URL first
    1 reply
    @greattang123 https://gitlab.com/aucampia/incubator/-/blob/master/osdu-ld/tools.py/src/osdu/ld/util.py#L143 < nasty code, but that is one place where I used it
    Thomas Tanon
    @Tpt
    Hi! I would love to get feedback on: RDFLib/rdflib#1396
    I am moving forward with my Oxigraph project (https://github.com/oxigraph/oxigraph) and I would love to be able to provide a fast rdflib store based on it.
    The task description a bit convoluted. I can work to make it clearer if needed
    Graham Higgins
    @gjhiggins
    I'm working in that area atm, trying to progress the "identifier-as-context" issue that's been extant since 2010 or thereabouts and which has had a couple of implementations, the last one being oohlaf's PR of RDFLib/rdflib#958. It's looking reasonably good thus far but there's a coupla aspects I'm not sure about but may just be down to terminological inexactitude - f'rinstance https://github.com/RDFLib/rdflib/blob/9379a69d6ec6e18819aa0c5a0d54849e7abb8223/rdflib/graph.py#L1558 where ConjunctiveGraph binds a Graph to the instance variable self.default_context.
    Thomas Tanon
    @Tpt
    @gjhiggins Great! Thank you! The PR you link does not solves my problem but seems a good step into the right direction
    4 replies
    Iwan Aucamp
    @aucampia
    @gjhiggins you developing on windows? If you want I can tune up the docker compose file a bit to make it easier and quicker to run tests
    should prbbably do it anyway
    Graham Higgins
    @gjhiggins
    's not my primary dev env, I'm on Mint and Python 3.9. I have an up-date-ish Win10 VM but that's running Python 3.10, so for modularity, I've just reinstated an old Windows10 VM and installed 3.8 on it. I also have Big Sur on a VM so I can investigate any MacOS-specific issues.
    Graham Higgins
    @gjhiggins
    @aucampia huh, tests all pass on WIndows10 VM with Python 3.8.10
    Graham Higgins
    @gjhiggins
    @aucampia aha, triples order varies with run, sometimes the sets match, sometimes they don't.
    Iwan Aucamp
    @aucampia
    I was actually just wondering how people run tests, I setup a virtual environment and run them in there, tox also works but it is quite fiddly if you just want to run one test file. Docker compose can maybe be the simplest option to run tests.
    Graham Higgins
    @gjhiggins
    venvs here, ftw. I have sublime text set up to run pytest on saving the file, I also just execute ./runtests.py /test/<the test> or just ./runtests.py
    Graham Higgins
    @gjhiggins
    I also have sublime test run black every time the file is saved and mypy every time it's opened. Might as well take advantage of these coding/development assistants, they do seem to help avoid committing typos/mispastes.
    If only they helped with brain farts :(
    Graham Higgins
    @gjhiggins
    @aucampia Thanks! I stole aucampia/rdflib@20b3d1c
    Iwan Aucamp
    @aucampia
    glad it helped :D
    Graham Higgins
    @gjhiggins
    Sadly, I had to revert, that particular approach creates failures in a whole buncha DAWG tests :(
    Iwan Aucamp
    @aucampia
    if you share branch and let me know what is happening I don't mind having a look also
    Graham Higgins
    @gjhiggins
    Will do, grateful for the offer. If that approach can be made to work, it'll relieve a particular pain point: ConjunctiveGraph.parse() creates a Graph to handle the parsing and has a profoundly-unwanted side-effect creates a BNode in the Store's contexts, which screws things up from the Dataset side.
    iwan.aucamp
    @iwan.aucamp:matrix.org
    [m]
    okay will check it out
    is there a test to reproduce? Maybe I can write one
    Graham Higgins
    @gjhiggins
    I pared it all down to just the rebased PR plus the changes from your commit and a file of tests which I took from my alternate thread of work - which preserves the original approach of using a Graph for parsing. https://github.com/DOACC/rdflib/tree/identifier-as-context