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Posted to users@jena.apache.org by Steve Vestal <st...@adventiumlabs.com> on 2021/05/18 13:59:22 UTC
SPARQL lite?
PubChemRDF, OSLC, and probably others define their own light-weight
query protocol, conceptually similar to the Jena Graph interface. I was
curious if there exists, or there are moves afoot to propose, a standard
"SPARQL lite" or BGP query protocol, closer to the Jena Graph or
StageGenerator interfaces than full SPARQL?
PubChem Re: SPARQL lite?
Posted by jerven Bolleman <je...@sib.swiss>.
Hi Steve,
Indeed the NCBI PubChem team is really worried about having a resilient
service, at least that is what I recall of the conversation over sake.
But with the lower cost of hosting a sparql endpoint they may change
their minds.
Also of interest is.
https://jcheminf.biomedcentral.com/articles/10.1186/s13321-021-00515-1
If you want a pubchem rdf sparql endpoint you should definitely ask them
for it.
Regards,
Jerven
On 18/05/2021 20:59, Steve Vestal wrote:
> Re use cases, the OSLC folks say they want to enable light-weight
> addition of OSLC support to existing servers of specialized data (they
> mention that nothing prevents SPARQL if vendors want to). It would be my
> own speculation, just a guess, that the US National Center for
> Biotechnology Information does not want to host full SPARQL query
> services for huge numbers of people.
>
> The BGP comment is informative, thanks. That would explain why these
> other solutions are also fairly simple single-triple-pattern sorts of
> things that can be encoded in the query part of a URL.
>
> On 5/18/2021 1:36 PM, Andy Seaborne wrote:
>>
>>
>>> On Tue, May 18, 2021 at 3:59 PM Steve Vestal
>>> <st...@adventiumlabs.com> wrote:
>>>>
>>>> PubChemRDF, OSLC, and probably others define their own light-weight
>>>> query protocol, conceptually similar to the Jena Graph interface. I
>>>> was
>>>> curious if there exists, or there are moves afoot to propose, a
>>>> standard
>>>> "SPARQL lite" or BGP query protocol, closer to the Jena Graph or
>>>> StageGenerator interfaces than full SPARQL?
>>>>
>> On 18/05/2021 15:06, Martynas Jusevičius wrote:
>>> Triple Pattern Fragments?
>>> https://linkeddatafragments.org/specification/triple-pattern-fragments/
>>>
>>
>> Hi Steve,
>>
>> What's the use cases behind those those light-weight query protocols?
>> There's a big difference between Graph.find and BGP here - Graph.find
>> (and TPF) are low impact on the storage/.
>>
>> That said, I think the bulding block is "triple pattern + filter". The
>> filter could test slots of the triple pattern maybe in a limited
>> fashion e.g. range
>>
>> { ?s ?p ?o . FILTER (?o > 10 && ?o < 500) }
>>
>> not FILTER(?x/2 - FLOOR(?x/2) != 0) ## Test ?x is odd
>>
>> and if a range, it's easy to make the query string parameters.
>>
>>
>> BGPs can be server-side expensive.
>>
>> Andy
>
--
*Jerven Tjalling Bolleman*
Principal Software Developer
*SIB | Swiss Institute of Bioinformatics*
1, rue Michel Servet - CH 1211 Geneva 4 - Switzerland
t +41 22 379 58 85
Jerven.Bolleman@sib.swiss - www.sib.swiss
Re: SPARQL lite?
Posted by Steve Vestal <st...@adventiumlabs.com>.
Re use cases, the OSLC folks say they want to enable light-weight
addition of OSLC support to existing servers of specialized data (they
mention that nothing prevents SPARQL if vendors want to). It would be my
own speculation, just a guess, that the US National Center for
Biotechnology Information does not want to host full SPARQL query
services for huge numbers of people.
The BGP comment is informative, thanks. That would explain why these
other solutions are also fairly simple single-triple-pattern sorts of
things that can be encoded in the query part of a URL.
On 5/18/2021 1:36 PM, Andy Seaborne wrote:
>
>
>> On Tue, May 18, 2021 at 3:59 PM Steve Vestal
>> <st...@adventiumlabs.com> wrote:
>>>
>>> PubChemRDF, OSLC, and probably others define their own light-weight
>>> query protocol, conceptually similar to the Jena Graph interface. I
>>> was
>>> curious if there exists, or there are moves afoot to propose, a
>>> standard
>>> "SPARQL lite" or BGP query protocol, closer to the Jena Graph or
>>> StageGenerator interfaces than full SPARQL?
>>>
> On 18/05/2021 15:06, Martynas Jusevičius wrote:
>> Triple Pattern Fragments?
>> https://linkeddatafragments.org/specification/triple-pattern-fragments/
>>
>
> Hi Steve,
>
> What's the use cases behind those those light-weight query protocols?
> There's a big difference between Graph.find and BGP here - Graph.find
> (and TPF) are low impact on the storage/.
>
> That said, I think the bulding block is "triple pattern + filter". The
> filter could test slots of the triple pattern maybe in a limited
> fashion e.g. range
>
> { ?s ?p ?o . FILTER (?o > 10 && ?o < 500) }
>
> not FILTER(?x/2 - FLOOR(?x/2) != 0) ## Test ?x is odd
>
> and if a range, it's easy to make the query string parameters.
>
>
> BGPs can be server-side expensive.
>
> Andy
Re: SPARQL lite?
Posted by Andy Seaborne <an...@apache.org>.
> On Tue, May 18, 2021 at 3:59 PM Steve Vestal
> <st...@adventiumlabs.com> wrote:
>>
>> PubChemRDF, OSLC, and probably others define their own light-weight
>> query protocol, conceptually similar to the Jena Graph interface. I was
>> curious if there exists, or there are moves afoot to propose, a standard
>> "SPARQL lite" or BGP query protocol, closer to the Jena Graph or
>> StageGenerator interfaces than full SPARQL?
>>
On 18/05/2021 15:06, Martynas Jusevičius wrote:
> Triple Pattern Fragments?
> https://linkeddatafragments.org/specification/triple-pattern-fragments/
>
Hi Steve,
What's the use cases behind those those light-weight query protocols?
There's a big difference between Graph.find and BGP here - Graph.find
(and TPF) are low impact on the storage/.
That said, I think the bulding block is "triple pattern + filter". The
filter could test slots of the triple pattern maybe in a limited fashion
e.g. range
{ ?s ?p ?o . FILTER (?o > 10 && ?o < 500) }
not FILTER(?x/2 - FLOOR(?x/2) != 0) ## Test ?x is odd
and if a range, it's easy to make the query string parameters.
BGPs can be server-side expensive.
Andy
Re: SPARQL lite?
Posted by Martynas Jusevičius <ma...@atomgraph.com>.
Triple Pattern Fragments?
https://linkeddatafragments.org/specification/triple-pattern-fragments/
On Tue, May 18, 2021 at 3:59 PM Steve Vestal
<st...@adventiumlabs.com> wrote:
>
> PubChemRDF, OSLC, and probably others define their own light-weight
> query protocol, conceptually similar to the Jena Graph interface. I was
> curious if there exists, or there are moves afoot to propose, a standard
> "SPARQL lite" or BGP query protocol, closer to the Jena Graph or
> StageGenerator interfaces than full SPARQL?
>
>