I was looking into this again... I see that RDFParserRegistry already
has the required collections langTriples and langQuads.

I think simply adding accessors for them would solve my use case.
Something like this maybe?

public static Set<Lang> registeredLangTriples()
{
    return Collections.unmodifiableSet(langTriples);
}

public static Set<Lang> registeredLangQuads()
{
    return Collections.unmodifiableSet(langQuads);
}


I don't see a similar collection under ResultSetReaderRegistry though?

On Mon, May 23, 2022 at 6:04 PM Andy Seaborne <a...@apache.org> wrote:
>
> PRs welcome.
>
> On 23/05/2022 08:51, Martynas Jusevičius wrote:
> > Could RDFParserRegistry::getRegistered and
> > ResultSetReaderRegistry::getRegistered be added?
>
> Consistent naming would be registered().
>
>      Andy
>
> > On Fri, May 20, 2022 at 9:01 PM Andy Seaborne <a...@apache.org> wrote:
> >>
> >>
> >>
> >> On 20/05/2022 14:05, Martynas Jusevičius wrote:
> >>> Andy, is that correct?
> >>
> >> Yes
> >>
> >>       Andy
> >>
> >>>
> >>> On Tue, May 17, 2022 at 1:33 PM Martynas Jusevičius
> >>> <marty...@atomgraph.com> wrote:
> >>>>
> >>>> On Tue, May 17, 2022 at 1:19 PM Andy Seaborne <a...@apache.org> wrote:
> >>>>>
> >>>>> RDFLanguages is a general registry of names (Lang's) in the system.
> >>>>>
> >>>>> It is not for functionality.
> >>>>>
> >>>>> RDFParserRegistry
> >>>>> RDFWriterRegistry
> >>>>> RowSetReaderRegistry, ResultSetReaderRegistry
> >>>>> RowSetWriterRegistry, ResultSetWriterRegistry
> >>>>> StreamRDFWriter
> >>>>>
> >>>>> A Lang needs looking up in a registry to see if there is support for it.
> >>>>
> >>>> Thanks, I didn't know these existed.
> >>>>
> >>>> But there are no RDFParserRegistry::getRegistered or
> >>>> ResultSetReaderRegistry::getRegistered methods?
> >>>>
> >>>> So do I still need to iterate RDFLanguages::getRegistered and check
> >>>> each Lang against
> >>>> RDFParserRegistry::isRegistered/ResultSetReaderRegistry::isRegistered?
> >>>>
> >>>>>
> >>>>>        Andy
> >>>>>
> >>>>> On 17/05/2022 09:54, Martynas Jusevičius wrote:
> >>>>>> Hi,
> >>>>>>
> >>>>>> After upgrading from 4.3.2 to 4.5.0, some of our RDF writing code
> >>>>>> started failing.
> >>>>>>
> >>>>>> It seems that this is due to RDFLanguages.isTriples(Lang.SHACLC)
> >>>>>> returning true, which messes up our content negotiation as it attempts
> >>>>>> to write Models as SHACLC. Can this be rectified?
> >>>>>>
> >>>>>> The RDFLanguages registry is a bit of an oxymoron in general. Right
> >>>>>> now it's a bag of all sorts of syntaxes Jena supports, half of which
> >>>>>> are not even "RDF languages". We need to iterate and filter the
> >>>>>> languages just to know which ones can be used to read/write Models,
> >>>>>> which can be used for ResultSets etc.:
> >>>>>> https://github.com/AtomGraph/Core/blob/master/src/main/java/com/atomgraph/core/MediaTypes.java#L86
> >>>>>> Wouldn't it make sense to have separate registries depending on the
> >>>>>> entity types they apply to?
> >>>>>>
> >>>>>> Thanks.
> >>>>>>
> >>>>>> Martynas

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