New API in libxml++ 5.2

Member xmlpp::Parser::callback_error_or_warning (bool is_parser, bool is_error, void * ctx, const char * msg, va_list var_args)
Member xmlpp::Parser::get_callback_parser_error_cfunc ()
Member xmlpp::Parser::get_callback_parser_warning_cfunc ()
Member xmlpp::Parser::get_callback_validity_error_cfunc ()
Member xmlpp::Parser::get_callback_validity_warning_cfunc ()
Member xmlpp::ParserCallbackCFuncType
Member xmlpp::Validator::callback_error_or_warning (bool error, void * ctx, const char * msg, va_list var_args)
Member xmlpp::Validator::get_callback_validity_error_cfunc ()
Member xmlpp::Validator::get_callback_validity_warning_cfunc ()
Member xmlpp::ValidatorCallbackCFuncType