Steve Blog

Just a short excursion to Sparql…

Sparql queries could be complex. Very often I struggle to create them or to read existent queries. Let me share my findings:

• Take the WHERE part of the Sparql query and create a graph. I draw it on simple paper and voilà you will see the search pattern.
• Also when you start with an new query, create a drawing first and then type the Sparql query.

Example:

PREFIX dc: <http://purl.org/dc/terms/&gt;
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt;
PREFIX oslc: <http://open-services.net/ns/core#&gt;
PREFIX oslc_cm: <http://open-services.net/ns/cm#&gt;
PREFIX oslc_qm: <http://open-services.net/ns/qm#&gt;

SELECT ?cm_shortTitle  ?cm_title  ?cm_uri  ?status  ?qm_title  ?qm_uri
WHERE {
?cm_uri oslc:shortTitle ?cm_shortTitle  ;
dc:title ?cm_title  ;
dc:modified ?modified ;
oslc_cm:status ?cm_status ;
oslc_cm:testedByTestCase ?qm_uri .
?qm_uri dc:title ?qm_title  .
}