what is the {instance of} for {Réunion} has {short name} as {} ?
Name the Reuion which has short name?
What Reuion has a short name as {}?
SELECT ?q WHERE { resource:Réunion property:short_name ?i . FILTER ( CONTAINS ( ?o , '' ) ) . ?i rdf:type ?q . ?i property:short_name ?o }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q17070> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1813> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <> .
?statement <http://www.wikidata.org/entity/P31> ?value. 
} 

SELECT ?value WHERE { wd:Q17070 p:P1813 ?s . ?s ps:P1813 ?x filter(contains(?x , '')) . ?s pq:P31 ?value}