Sounds like xml2, which is in the Debian and Ubuntu repos: https://web.archive.org/web/20160510001507/http://dan.egnor.name/xml2/ref https://web.archive.org/we

Sounds like xml2, which is in the Debian and Ubuntu repos: https://web.archive.org/web/20160510001507/http://dan.egnor.name/xml2/ref https://web.archive.org/web/20160510001507/http://dan.egnor.... https://web.archive.org/web/20100113205649/http://dan.egnor.name/xml2/examples https://web.archive.org/web/20100113205649/http://dan.egnor.... https://packages.debian.org/search?keywords=xml2 https://packages.debian.org/search?keywords=xml2 https://packages.debian.org/sid/xml2 https://packages.debian.org/sid/xml2 https://packages.ubuntu.com/focal/utils/xml2 https://packages.ubuntu.com/focal/utils/xml2