On 10/02/15 15:19, Richard Davenport wrote:
Greetings,
I'm developing a project using ODC data (http://opendatacommunities.org/).
I think opendatacommunities.org runs with tdb:unionDefaultGraph set.
Bill - is that true?
Andy
(I'm sure I answered this recently)
The endpoint (http://opendatacommunities.org/sparql) has limited capacity
such that it cannot be used for production environments (queries regularly
fail, timeout), so therefore I created a Fuseki service using a TBD
dataset. I then downloaded .nt dumps of each graph I wanted to use (like
http://opendatacommunities.org/data/homelessness/homelessness-acceptances/ethnicity)
and uploaded them without issue.
While I am able to successfully get results for simple queries (like just
returning ?s ?p ?o), more specific queries return zero results without
error.
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX dim: <http://purl.org/linked-data/sdmx/2009/dimension#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX apf: <http://jena.hpl.hp.com/ARQ/property#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX tgt: <
http://opendatacommunities.org/graph/homelessness/homelessness-acceptances/ethnicity
PREFIX fn: <http://www.w3.org/2005/xpath-functions#>
SELECT DISTINCT ?rp ?label
WHERE
{ ?property (rdfs:subPropertyOf)* dim:refPeriod .
?rp rdfs:label ?label
GRAPH tgt:
{ ?subject ?property ?rp}
}
ORDER BY ?rp
LIMIT 1
The above query works (sometimes!) on the original endpoint against the
original graph (run it by clicking here: http://tinyurl.com/ohmnxfh).
However, the same does not result from my Fuseki service - despite
replacing tgt: with the correct URI of the graph on my server, ensuring
that the other prerequisite PREFIXs are correctly defined, and trying to
read up/troubleshoot.
My server/environment is inside a private network which cannot be accessed
from outside, therefore I'm unable to provide public access to my endpoint
for testing. However, I am grateful for any advice in solving this problem
and any tests or workarounds :)
Kind Regards,
Richard.
