/usr/lib/swi-prolog/library/DTD/HTML4.soc is in swi-prolog-nox 5.10.4-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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SGMLDECL HTML4.dcl
DOCTYPE HTML HTML4.dtd
PUBLIC "-//W3C//ENTITIES Latin1//EN//HTML" HTMLlat1.ent
PUBLIC "-//W3C//ENTITIES Special//EN//HTML" HTMLspec.ent
PUBLIC "-//W3C//ENTITIES Symbols//EN//HTML" HTMLsym.ent
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