Re: Expected behavior when serializing named graphs using a format that does not support named graphs

good morning;

in the context of the original question, the closer analogy might be to

   CONSTRUCT { ?s ?p ?o} WHERE { GRAPH ?g { ?s ?p ?o } }

but the sentiment remains the same: follow the expressed intent.

> On 21. May 2023, at 10:07, Reto Gmür <reto@factsmission.com> wrote:
> 
> Good morning.
> 
> I'd recommend to be consistent with CONSTRUCT { ?s ?p ?o} WHERE { ?s ?p ?o } and to serialize the default graph by default.
> 
> May 21, 2023 6:48:19 AM James Anderson <anderson.james.1955@gmail.com>:
> 
>> good morning;
>> 
>> the issue is similar for graph store protocol put and post operations and for sparql update load and insert operations.
>> the insert operation is the only one which is explicit about the consequences of the various combinations.
>> if one takes it as the precedent, the effect should be to do what the operation variant says to do.
>> in this case, drop the graph.
>> 
>>> On 21. May 2023, at 00:16, Iwan Aucamp <aucampia@gmail.com> wrote:
>>> 
>>> Hi
>>> 
>>> I would like some feedback on what people think the right behaviour should be when serializing named graphs using a format that does not support named graphs like Turtle or N-Quads.
>>> 
>>> These are :
>>>     •
>>> Raise an error: Indicate to the caller that the requested operation cannot be completed successfully. The output in this case is somewhat open-ended, in case of streaming there could be some output, though I would expect the output to be a subset of #2, not of #3.
>>>     • Only output triples from the default graph, but don't output triples from named graphs without raising an error.
>>>     • Output triples from the named graphs without a graph label without raising an error.
>>> 
>>> To me, #1 seems right - though Python RDFLib does #3 and Jena does #2.
>>> 
>>> Two GitHub issues related to this are:
>>> 
>>> - <https://github.com/RDFLib/rdflib/issues/2393>: Formats that don't support named graphs serialize Datasets and ConjunctiveGraphs with non-default graphs without raising any errors
>>> - <https://github.com/apache/jena/issues/1873>: Using riot with N-Quads input with named graphs and N-Triples/Turtle output silently drops part of the input #1873
>>> 
>>> Regards
>>> Iwan Aucamp
>> 
>> ---
>> james anderson | james@dydra.com | https://dydra.com

---
james anderson | james@dydra.com | https://dydra.com

Received on Sunday, 21 May 2023 08:16:36 UTC