/usr/share/texlive/texmf-dist/tex/xmltex/base/langtest.xmt is in texlive-htmlxml 2015.20160320-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | \XMLelement{langtest}
{}
{\documentclass{article}
\usepackage[OT2,OT1]{fontenc}
\pagestyle{headings}
\begin{document}
\tableofcontents}
{\end{document}}
\XMLelement{document}
{\XMLattribute{att}{\langatt}{}}{}{}
\XMLelement{head}
{}{\xmlgrab}{\section{#1 (\langatt)}}
\XMLelement{documento}
{\XMLattribute{att}{\langatt}{}}{}{}
\XMLelement{cabeçalho}
{}{\xmlgrab}{\section{#1 (\langatt)}}
\XMLelement{документ}
{\XMLattribute{атт}{\langatt}{}}{\fontencoding{OT2}\selectfont}{}
\XMLelement{голова}
{}{\xmlgrab}{\section{\fontencoding{OT2}\selectfont#1 (\langatt)}}
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