Re: How do you explore a SPARQL Endpoint?

In order to explore the schema (or better said: the types of the actual 
nodes and properties) you could do:

select ?type1 ?pred ?type2
where {
?subj ?pred ?obj.
?subj a ?type1.
?obj a ?type2.
}

Depending on the triple store, it could be useful to filter some trivial 
types.


Il 22/01/15 15:28, Thomas Francart ha scritto:
> SELECT DISTINCT ?type
> WHERE {   ?x rdf:type ?type . }
>
> SELECT DISTINCT ?p
> WHERE {   ?s ?p ?o .. }
>
> then
>
> SELECT ?s
> WHERE {
>   ?s a <http://uri_of_a_type>
> } LIMIT 100
>
> and then
>
> DESCRIBE <http://uri_of_an_instance>
>
> or
>
> SELECT ?p ?o
> WHERE {
>   <http://uri_of_an_instance> ?p ?o .
> }
>
> Having some statistics on the types may help too :
>
> SELECT ?type (COUNT(?instance) AS ?count)
> WHERE {
>     ?instance a ?type .
> } GROUP BY ?type
>
>
> 2015-01-22 15:19 GMT+01:00 Luca Matteis <lmatteis@gmail.com 
> <mailto:lmatteis@gmail.com>>:
>
>     "Give me all your types" seems the most sensible thing to do.
>     Otherwise full text search.
>
>     On Thu, Jan 22, 2015 at 3:09 PM, Juan Sequeda
>     <juanfederico@gmail.com <mailto:juanfederico@gmail.com>> wrote:
>     > 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 <http://www.juansequeda.com>
>
>
>
>
> -- 
> *
> *
> *Thomas Francart* - Sparna
> Consultant Indépendant
> Data, Sémantique, Contenus, Connaissances
> web : http://sparna.fr, blog : http://blog.sparna.fr
> Tel :  +33 (0)6.71.11.25.97
> Fax : +33 (0)9.58.16.17.14
> Skype : francartthomas