tuned signature -- avoid intrusion of slightly odd Swing structures into pure Markup_Tree;
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%% default hyperref setup (both for pdf and dvi output)
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\usepackage{color}
\definecolor{linkcolor}{rgb}{0,0,0.5}
\usepackage[colorlinks=true,linkcolor=linkcolor,citecolor=linkcolor,filecolor=linkcolor,pagecolor=linkcolor,urlcolor=linkcolor]{hyperref}