What is {child} of {Charlemagne} and {date of birth}
What was the name of Charlemagne child & when was he or she born?
Who was the child of Charlemagne and when were they born?
SELECT ?h ?k WHERE { resource:Charlemagne property:child ?d . ?d property:date_of_birth ?h . . ?d property:child ?k }
select distinct ?dataprop1 ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q3044> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P40> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?statement <http://www.wikidata.org/entity/P580> ?dataprop1 . } 
SELECT ?value1 ?obj WHERE { wd:Q3044 p:P40 ?s . ?s ps:P40 ?obj . ?s pq:P569 ?value1 . }