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 <[email protected]
<mailto:[email protected]>>:
"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
<[email protected] <mailto:[email protected]>> 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>
--
*
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*Thomas Francart* - Sparna
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