what is the {place of marriage} for {Catherine, Duchess of Cambridge} has {spouse} as {Prince William, Duke of Cambridge} ?
Where were Catharine, Duchess of Cambridge and Prince William, Duke of Cambridge wedded?
Where were Catharine, Duchess of Cambridge and Prince William, Duke of Cambridge married?
SELECT ?t WHERE { resource:Kate_Middleton property:spouse ?u . ?u property:spouse resource:Prince_William,_Duke_of_Cambridge . ?u property:place_of_marriage ?t }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q10479> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q36812> .
?statement <http://www.wikidata.org/entity/P2842> ?value. 
} 

SELECT ?value WHERE { wd:Q10479 p:P26 ?s . ?s ps:P26 wd:Q36812 . ?s pq:P2842 ?value}