/usr/share/sgml/entities/sgml-iso-entities-8879.1986/ is in sgml-data 2.0.10.
This file is owned by root:root, with mode 0o755.
..
/usr/share/sgml/entities/sgml-iso-entities-8879.1986/ISOamsa.ent
/usr/share/sgml/entities/sgml-iso-entities-8879.1986/ISOamsb.ent
/usr/share/sgml/entities/sgml-iso-entities-8879.1986/ISOamsc.ent
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/usr/share/sgml/entities/sgml-iso-entities-8879.1986/ISOtech.ent
/usr/share/sgml/entities/sgml-iso-entities-8879.1986/catalog