  Spin observables in the photoproduction of the $\Theta^+$ are explored for
the purpose of determining the parity of the $\Theta^+$. Based on reflection
symmetry in the scattering plane, we show that certain spin observables in the
photoproduction of the $\Theta^+$ can be related directly to its parity. We
also show that measurements of both the target nucleon asymmetry and the $%
\Theta^+$ polarization may be useful in determining the parity of $\Theta^+$ in
a model-independent way. Furthermore, we show that no combination of spin
observables involving only the polarization of the photon and/or nucleon in the
initial state can determine the parity of $\Theta^+$ unambiguously.
