02_findAllConceptSchemesInGraph.sparql

#This Query will find all the conceptSchemes in the graph and their definitions (where present).

PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
 
#Display everything available from the query
SELECT *

WHERE {

#Primary Subject: return all ConceptSchemes (whole vocabularies) in the graph and their preferred labels
?conceptScheme a skos:ConceptScheme ;
skos:prefLabel ?preflabel .

#Set Optional returns (to ignore sparql null rule), i.e. return blank instead of preventing result
#Based on the ?ConceptScheme defined in the last step.
OPTIONAL {?conceptScheme skos:definition ?definition}. #optional definitions

#Apply filters
FILTER(LANG(?preflabel)="en") #restrict to results with an english language label
}

#Display in order of: the uri of the conceptSchemes
ORDER BY ?conceptScheme