$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
8.62
\begin{equation} \begin{gathered}\label{equation:covariant-transport-categorical-pullback-square2} \xymatrix@R =50pt@C=50pt{ \mathscr {F}_{00} \ar [r] \ar [d] & \mathscr {F}_{01} |_{ \operatorname{\mathcal{D}}_{00} } \ar [d] \\ \mathscr {F}_{10} |_{ \operatorname{\mathcal{D}}_{00} } \ar [r] & \mathscr {F}_{11} |_{ \operatorname{\mathcal{D}}_{00} } } \end{gathered} \end{equation}