Query using SPARQL service

[Charan Puvvala]

I am trying to query getty TGN which is huge for me to load. I get this error 

"500 SPARQL-QUERY: ?Service calls not supported"

Doesn't getty support sparql queries directly as a service? Am I missing something?

[Richard Light]

Charan,

What access point are you using? http://vocab.getty.edu/sparql ?

Richard

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[Charan Puvvala]

Yes I am using the same one

PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX gvp: <http://vocab.getty.edu/ontology#>
PREFIX schema: <http://schema.org/>
SELECT ?focus ?biographyPreferred ?birthPlace ?deathPlace ?dPlace WHERE {
  {
    ?person foaf:focus ?focus.
    ?focus gvp:biographyPreferred ?biographyPreferred.
    ?biographyPreferred schema:birthPlace ?birthPlace.
    ?biographyPreferred schema:deathPlace ?deathPlace.
  }
  SERVICE <http://vocab.getty.edu/sparql> {
      ?dPlace foaf:focus ?deathPlace .
   }
  FILTER(?person = <http://vocab.getty.edu/ulan/500010879>)
}

[Richard Light]

Charan,

Why you do need to call out that specific criterion as a separate service call?  I simplified your search to:

PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX gvp: <http://vocab.getty.edu/ontology#>
PREFIX schema: <http://schema.org/>
SELECT ?focus ?biographyPreferred ?birthPlace ?deathPlace ?dPlace WHERE {
  {
    ?person foaf:focus ?focus.
    ?focus gvp:biographyPreferred ?biographyPreferred.
    ?biographyPreferred schema:birthPlace ?birthPlace.
    ?biographyPreferred schema:deathPlace ?deathPlace.

    ?dPlace foaf:focus ?deathPlace .
   }
  FILTER(?person = <http://vocab.getty.edu/ulan/500010879>)
}

and it returned a result immediately.  Are you searching other endpoints as well, and if so where are you performing the [federated] search?

Richard

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Richard Light

[Charan Puvvala]

I have a metaphacts instance which has the ULAN vocab imported. I do not have enough space to import the TGN, hence trying to query remotely to get the name of the place.

[Richard Light]

On 23/02/2018 14:39, Charan Puvvala wrote:

I have a metaphacts instance which has the ULAN vocab imported. I do not have enough space to import the TGN, hence trying to query remotely to get the name of the place.

Thanks for the explanation.  In that case, I think we all wait for someone from the Getty to pop up and answer your original question.  Though I suspect the answer will be 'no we don't'.  The error message is pretty unequivocal.

Best wishes,

Richard

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[Charan Puvvala]

Richard,

No problem, that was my initial suspicion as well. Thanks for your time. Lots of your other discussion posts helped me. :)

[Kevin Ford]

Hi Charan,

I think this is an issue with metaphacts, which you said you were using
in another post.

*Your* SPARQL query is hitting metaphacts's /sparql endpoint and I
suspect it is *your* SPARQL endpoint saying, effectively, "this sparql
endpoint does not implement the Sparql 1.1 SERVICE keyword." I've done
some light searching to determine whether metaphacts supports this
feature or not, but I've had no success.

FWIW, if I start a local copy of blazegraph - a triplestore that
implements the Sparql 1.1 SERVICE extension - and I execute the
following query, I get results back (from Getty):

SELECT *
WHERE {
SERVICE <http://vocab.getty.edu/sparql> {
?gs ?gp "Gogh, Vincent van" .
}
}

Blazegraph is effectively querying Getty's sparql endpoint just as any
client would. Said another way, Getty really doesn't need to do
anything on its end, beyond establishing a sparql endpoint, which it has
done, to respond to the SERVICE request. Blazegraph or metaphacts,
however, must have the smarts to understand what to do with the SERVICE
keyword. The former does, but I'm doubtful at this time that metaphacts
does.

HTH,
Kevin

On 2/23/18 07:54, Charan Puvvala wrote:
> I am trying to query getty TGN which is huge for me to load. I get this
> error
>

> *"*500 SPARQL-QUERY: *?Service calls not supported"*
> *
> *

> Doesn't getty support sparql queries directly as a service? Am I missing
> something?
>

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[Kevin Ford]

Hi Richard, Charan, all:

I want to offer a modest and collegial tweak to Richard's query. The
FILTER is unnecessary. This will work too:

PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX gvp: <http://vocab.getty.edu/ontology#>
PREFIX schema: <http://schema.org/>
SELECT ?focus ?biographyPreferred ?birthPlace ?deathPlace ?dPlace WHERE {

<http://vocab.getty.edu/ulan/500010879> foaf:focus ?focus.

?focus gvp:biographyPreferred ?biographyPreferred.
?biographyPreferred schema:birthPlace ?birthPlace.
?biographyPreferred schema:deathPlace ?deathPlace.
?dPlace foaf:focus ?deathPlace .
}

I only bring this up because, while I think it is fantastic that Getty's
triplestore (it's OpenLink, yes?) optimizes the query under the hood and
handles this pattern with speed and efficiency, other, less-optimized
triplestores *might* return the entire result set and *then* perform the
FILTER. That could be costly for the endpoint.

Since the subject is known, we can initiate the query using that as an
anchor, or starting point.

All the best,
Kevin

>>> *"*500 SPARQL-QUERY: *?Service calls not supported"*
>>> *
>>> *

>>> Doesn't getty support sparql queries directly as a service? Am I
>>> missing something?
>>> --
>>> You received this message because you are subscribed to the
>>> Google Groups "Getty Vocabularies as Linked Open Data" group.
>>> To unsubscribe from this group and stop receiving emails from it,
>>> send an email to gettyvocablo...@googlegroups.com.
>>> To post to this group, send email to gettyv...@googlegroups.com.
>>> To view this discussion on the web visit
>>> https://groups.google.com/d/msgid/gettyvocablod/535bd79d-649e-40e3-9530-deba88350ba6%40googlegroups.com

>>> <https://groups.google.com/d/msgid/gettyvocablod/535bd79d-649e-40e3-9530-deba88350ba6%40googlegroups.com?utm_medium=email&utm_source=footer>.

>>> For more options, visit https://groups.google.com/d/optout

>>> <https://groups.google.com/d/optout>.
>>
>> --
>> *Richard Light*

>>
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>> For more options, visit https://groups.google.com/d/optout.
>
> --

> *Richard Light*

>
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[Richard Light]

Good call, Kevin: thank you for pointing that out.

Richard

.

--
Richard Light

[vladimir...@ontotext.com]

Charan, Metaphacts don't make a repository. AFAIK they use Blazegraph most of the time.
Kevi, the Getty repo is Ontotext GraphDB.
Cheers!