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Re: How do you explore a SPARQL Endpoint?

From: Cifuentes, Francisco <fcifuentes@bcn.cl>
Date: Thu, 22 Jan 2015 11:40:46 -0300
To: Semantic Web <semantic-web@w3.org>, public-lod public <public-lod@w3.org>
Message-ID: <web-3697167@dichato.bcn.cl>
Complementary:

SELECT count (*)
WHERE {
?s ?p ?o .
}

It is useful to know the number of triples in the sparql endpoint.

Regards.



On Thu, 22 Jan 2015 15:27:24 +0100
Bernard Vatant <bernard.vatant@mondeca.com> wrote:
> Hi Juan
> 
> My strategy is as following
> 
> Q1 : Which types are used?
> SELECT DISTINCT ?type
> WHERE {?x rdf:type ?type}
> 
> Q2 : Which predicates are used?
> SELECT DISTINCT ?p
> WHERE {?x ?p ?o}
> 
> Q3 : Which predicates are used by instances of the type :foo found 
>in Q1
> I'm interested in
> SELECT DISTINCT ?p
> WHERE {?x ?p :foo}
> 
> 
> 2015-01-22 15:09 GMT+01:00 Juan Sequeda <juanfederico@gmail.com>:
> 
>> Assume you are given a URL for a SPARQL endpoint. You have no idea 
>>what
>> data is being exposed.
>>
>> What do you do to explore that endpoint? What queries do you write?
>>
>> Juan Sequeda
>> +1-575-SEQ-UEDA
>> www.juansequeda.com
>>
> 
> 
> 
> -- 
> 
> *Bernard Vatant*
> Vocabularies & Data Engineering
> Tel :  + 33 (0)9 71 48 84 59
> Skype : bernard.vatant
> http://google.com/+BernardVatant
> --------------------------------------------------------
> *Mondeca*
> 35 boulevard de Strasbourg 75010 Paris
> www.mondeca.com
>Follow us on Twitter : @mondecanews 
><http://twitter.com/#%21/mondecanews>
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______________________

Francisco Cifuentes Silva
Sistemas y Servicios de InformaciĆ³n en Red
Biblioteca del Congreso Nacional de Chile
Tel: +56 032 2263969
Received on Friday, 23 January 2015 09:08:18 UTC

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