fd::write_xml_interval_schedule — Write a schedule to a xml stream, encoded in utf-8.
// In header: <fd/ptree_io_xml.h> void write_xml_interval_schedule(std::ostream & os, const std::list< interval_schedule_definition > & schedules, const std::function< void(boost::property_tree::ptree &, const interval_schedule_data &)> & write_appdata = {}, std::initializer_list< std::pair< boost::property_tree::ptree::key_type, boost::property_tree::ptree::data_type > > ns = {});