Question: Which american football player's current team is Michigan Wolverines and former team was  Baltimore Ravens ?
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 {?uri prop:currentteam <http://dbpedia.org/resource/Michigan_Wolverines> . ?uri onto:formerTeam <http://dbpedia.org/resource/1998_Baltimore_Ravens_season>  . ?uri rdf:type onto:AmericanFootballPlayer}