$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
10.22
\begin{equation} \begin{gathered}\label{equation:image-in-infinity} \xymatrix@R =50pt@C=50pt{ & Y_0 \ar [dr]^{i} & \\ X \ar [ur]^{q} \ar [rr]^{f} & & Y } \end{gathered} \end{equation}