  This article addresses the question of general rogue-wave solutions in the
nonlocal parity-time-symmetric nonlinear Schrodinger equation. By generalizing
the previous bilinear Kadomtsev-Petviashvili reduction method, large classes of
rogue waves are derived as Gram determinants with Schur polynomial elements. It
is shown that these rogue waves contain previously reported ones as special
cases. More importantly, they contain many new rogue wave families. It is
conjectured that the rogue waves derived in this article are all rogue-wave
solutions in the parity-time-symmetric nonlinear Schrodinger equation.
