Man pages matching name latexml::core::definition::chardef in section 3pm:

LaTeXML::Core::Definition::CharDef.3pm.en	debian 10 / latexml
LaTeXML::Core::Definition::CharDef.3pm.en	debian 11 / latexml
LaTeXML::Core::Definition::CharDef.3pm.en	debian 12 / latexml