What is <has facility> of <defensive wall> ?
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Which is the facility of the defensive wall?
SELECT DISTINCT ?r WHERE { ?r property:has_facility resource:defensive_wall }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P912> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q57346>. }
select distinct ?answer where { ?answer wdt:P912 wd:Q57346}
fortified town