PREFIX : <http://xmlns.com/foaf/0.1/>
SELECT ?no 
WHERE 
{
  GRAPH <http://spypixel.com/2006/foafid/eg1.rdf>
  {
    [ 
      a :Person ;
      :hasRole 
        [ 
          a :Role ; 
          :hasVCE [ :telNo ?no ] .
        ] 
    ] .
  }
}