/usr/share/liblouisxml/ is in liblouisxml-data 2.4.0-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/liblouisxml/lbx_files/
/usr/share/liblouisxml/lbx_files/ThML.sem
/usr/share/liblouisxml/lbx_files/Workbook.sem
/usr/share/liblouisxml/lbx_files/article.sem
/usr/share/liblouisxml/lbx_files/book.sem
/usr/share/liblouisxml/lbx_files/canonical.cfg
/usr/share/liblouisxml/lbx_files/chapter.sem
/usr/share/liblouisxml/lbx_files/default.cfg
/usr/share/liblouisxml/lbx_files/doc.sem
/usr/share/liblouisxml/lbx_files/document.sem
/usr/share/liblouisxml/lbx_files/dtbook.sem
/usr/share/liblouisxml/lbx_files/dtbook3.sem
/usr/share/liblouisxml/lbx_files/gutbook.sem
/usr/share/liblouisxml/lbx_files/html.sem
/usr/share/liblouisxml/lbx_files/marburg.cfg
/usr/share/liblouisxml/lbx_files/marburg.sem
/usr/share/liblouisxml/lbx_files/math.sem
/usr/share/liblouisxml/lbx_files/nemeth.sem
/usr/share/liblouisxml/lbx_files/package.sem
/usr/share/liblouisxml/lbx_files/preface.sem
/usr/share/liblouisxml/lbx_files/set.sem
/usr/share/liblouisxml/lbx_files/ukmaths.cfg
/usr/share/liblouisxml/lbx_files/ukmaths.sem
/usr/share/liblouisxml/lbx_files/w_wordDocument.sem
/usr/share/liblouisxml/lbx_files/wordDocument.sem