Question: What is the former team of the football player who is the coach of 2006 Oakland Raiders season ?
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 ?uri WHERE { <http://dbpedia.org/resource/2006_Oakland_Raiders_season> prop:coach ?x . ?x onto:formerTeam ?uri  . ?x rdf:type onto:AmericanFootballPlayer}