Man pages matching name sgml::dtdparse::dtd in section 3pm:

SGML::DTDParse::DTD.3pm.en	debian 10 / libsgml-dtdparse-perl
SGML::DTDParse::DTD.3pm.en	debian 11 / libsgml-dtdparse-perl
SGML::DTDParse::DTD.3pm.en	debian 12 / libsgml-dtdparse-perl