Re: Making querying of annotations optional

Of course there are no systems that support this syntax.

But that is completely beside the point.  The point is that even if this was 
accepted syntax there would still be two BGP-like components so I don't see 
why this "nice" syntax is any better with respect to having fewer BGP-like 
components.

peter


On 8/9/24 04:34, Thomas Lörtsch wrote:
> 
> 
>> On 8. Aug 2024, at 18:38, Peter F. Patel-Schneider <pfpschneider@gmail.com> wrote:
>>
>>
>>
>> On 8/8/24 12:02, Thomas Lörtsch wrote:
>>> tl;dr
>>> =====
>>> Querying annotated triples seems to always require its own BGP expression, no matter if the triple so annotated exists in the graph or not. It seems like the annotation can never be just an option, added to a query for simple triples.
>>> Asked concretely: is there a way to make the ?src information optional in the query using annotation syntax? E.g. something like
>>>   SELECT ?x ?age ?src
>>>   WHERE { ?x foaf:age ?age  OPTIONAL {| :src ?src |} . }
>>
>> But this has two BGPs so an extra BGP is included here.  So what is your point?
> 
> If you know of an implementation that supports this syntax, then please provide a pointer.
> 
> Thomas
> 
>> peter
>

Received on Friday, 9 August 2024 16:54:34 UTC