Question: What is the total number of politicians whose predecessor's deputy is Jenny Macklin?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x prop:deputy <http://dbpedia.org/resource/Jenny_Macklin> . ?uri prop:predecessor ?x . ?uri rdf:type onto:OfficeHolder}