what is the {country} for {Christmas} has {instance of} as {public holiday} ?
Which nations observe Christmas as a public holiday?
What countries celebrate Christmas as a public holiday?
SELECT ?w WHERE { ?p rdf:type ontology:public_holiday . ?p property:country ?w . resource:Christmas rdf:type ?p }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q19809> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1197685> .
?statement <http://www.wikidata.org/entity/P17> ?value. 
} 

SELECT ?value WHERE { wd:Q19809 p:P31 ?s . ?s ps:P31 wd:Q1197685 . ?s pq:P17 ?value}