Command.State: add reported positions to markup tree, according main message position or Markup.binding/entity/report occurrences in body;
Position.Id_Range convenience;
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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}