/usr/share/kde4/apps/katexmltools/ is in kate-data 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/apps/katexmltools/html4-loose.dtd.xml
/usr/share/kde4/apps/katexmltools/html4-strict.dtd.xml
/usr/share/kde4/apps/katexmltools/kcfg.dtd.xml
/usr/share/kde4/apps/katexmltools/kde-docbook.dtd.xml
/usr/share/kde4/apps/katexmltools/kpartgui.dtd.xml
/usr/share/kde4/apps/katexmltools/language.dtd.xml
/usr/share/kde4/apps/katexmltools/simplify_dtd.xsl
/usr/share/kde4/apps/katexmltools/testcases.xml
/usr/share/kde4/apps/katexmltools/xhtml1-frameset.dtd.xml
/usr/share/kde4/apps/katexmltools/xhtml1-strict.dtd.xml
/usr/share/kde4/apps/katexmltools/xhtml1-transitional.dtd.xml
/usr/share/kde4/apps/katexmltools/xslt-1.0.dtd.xml