SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/monarch> <http://dbpedia.org/resource/Willem-Alexander_of_the_Netherlands> . ?uri <http://dbpedia.org/ontology/leader> ?x . }
What are the things whose leader was a monarch Willem-Alexander of the Netherlands?
SELECT DISTINCT ?l WHERE { ?l property:leader ?l . . ?l property:monarch resource:Willem-_Alexander_of_the_Netherlands }
answer
The legislatures whose leader's monarch is Willem-Alexander of the Netherlands are [answer].
The parliamentarians for whom Willem-Alexander of the Netherlands stands are [answer].