QueryRoot
   Projection
      ProjectionElemList
         ProjectionElem "s"
         ProjectionElem "name"
      StatementSourcePattern
         Var (name=s)
         Var (name=_const_23b7c3b6_uri, value=http://xmlns.com/foaf/0.1/name, anonymous)
         Var (name=name, value="Person1")
         StatementSource (id=endpoint1, type=REMOTE)
         StatementSource (id=endpoint2, type=REMOTE)
         BoundFilters (name="Person1")
