\begin{overpic}[width=0.49\textwidth]{AON-18}
\put(1,74){\colorbox{white}{(\sublabel{AON-18}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20150913160719-244450}{AON-18}}}
%%(\subref{AON-18}) \href{AON-18}
\color{red}
\end{overpic}
<?xml version="1.0" encoding="UTF-8"?>
<acquisitions>
</acquisitions>