names of persons who either are older than 18 or have a DL:

g.V()
  .label('person')
  .or (
    has ('age', gt(18)),
    has ('DL')
  )
  .values ('name')


names of persons who are both actors and directors, together with
the title of the movie they acted in, resp, directed:

g.V()
 .label ('person')
 .as ('p') .values ('name') .as ('n')
 .out ('ACTED_IN'). as ('m1') .values ('title') .as ('t1')
 .select ('p')
 .out ('DIRECTED'). as ('m2') .values ('title') .as ('t2')
 .select ('n', 't1', 't2')