\begin{table}
\centering
\caption{Grammar for Rational Polynomials}
\label{tab:ratpol}       % Give a unique label
\begin{tabular}{lll|lll|lll}  
Exp & $\rightarrow$ & Poly / Poly & Trm & $\rightarrow$ & Coef * Prod  & Coef &$\rightarrow$ & ''x0'' \textbar ''x1''\tabularnewline
Poly & $\rightarrow$ & Trm & Prod & $\rightarrow$ & Var   & Var & $\rightarrow$ & ''v0''\textbar ''v1''\tabularnewline
Poly & $\rightarrow$ & Trm + Poly& Prod & $\rightarrow$ &  Var * Prod & &&\tabularnewline
\end{tabular}
\end{table}