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/usr/lib/swi-prolog/library/DTD/HTML4.soc is in swi-prolog-nox 6.6.4-2ubuntu1.

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OVERRIDE YES
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