What is {birth date} of {writers} of {Principia Mathematica} ?
What is the birth date of author Principia Mathematica?
What is the birth date of writer Principia Mathematica?
SELECT ?l WHERE { resource:Principia_Mathematica property:author ?o . ?o property:date_of_birth ?l }
SELECT ?answer WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q163335> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P50>. ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?X . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?X. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P569> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer . }
SELECT ?answer WHERE { wd:Q163335 wdt:P50 ?X . ?X wdt:P569 ?answer}
1872-05-18T00:00:00Z 1861-02-15T00:00:00Z