https://mirror.math.princeton.edu/pub/ubuntu/pool/universe/libs/libsgml-parser-opensp-perl/?C=D;O=D
Index of /pub/ubuntu/pool/universe/libs/libsgml-parser-opensp-perl
index ofpububuntupool
https://packages.debian.org/forky/libsgml-dtdparse-perl
Debian -- Details of package libsgml-dtdparse-perl in forky
Perl modules and scripts for manipulating SGML and XML DTDs
debiandetailspackageperlforky