/usr/share/xml/docbook/schema/dtd/4.5/ is in docbook-xml 4.5-7.3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xml/docbook/schema/dtd/4.5/calstblx.dtd
/usr/share/xml/docbook/schema/dtd/4.5/catalog
/usr/share/xml/docbook/schema/dtd/4.5/catalog.xml
/usr/share/xml/docbook/schema/dtd/4.5/dbcentx.mod
/usr/share/xml/docbook/schema/dtd/4.5/dbgenent.mod
/usr/share/xml/docbook/schema/dtd/4.5/dbhierx.mod
/usr/share/xml/docbook/schema/dtd/4.5/dbnotnx.mod
/usr/share/xml/docbook/schema/dtd/4.5/dbpoolx.mod
/usr/share/xml/docbook/schema/dtd/4.5/docbook.cat
/usr/share/xml/docbook/schema/dtd/4.5/docbookx.dtd
/usr/share/xml/docbook/schema/dtd/4.5/ent
/usr/share/xml/docbook/schema/dtd/4.5/htmltblx.mod
/usr/share/xml/docbook/schema/dtd/4.5/soextblx.dtd