$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
10.29
\begin{equation} \begin{gathered}\label{equation:reflective-localization-regular} \xymatrix@C =50pt@R=50pt{ X' \ar [r]^-{f'} \ar [d] & Z' \ar [d]^{g} \\ X \ar [r]^-{f} & Z } \end{gathered} \end{equation}