Hi all, I am trying to introduce XML serialization in my project, but even with the simplest test, I cannot get something to work. Here is what I did: #define PARAMETERS_HPP #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <iostream> class rss_feeds_to_parse { public: bool all; template<class Archive> void serialize(Archive & ar, const unsigned int file_version) { ar & BOOST_SERIALIZATION_NVP(all); } }; class parameters { public: rss_feeds_to_parse feeds; template<class Archive> void serialize(Archive & ar, const unsigned int file_version) { ar & BOOST_SERIALIZATION_NVP(feeds); } }; #endif // PARAMETERS_HPP Later, in my main, I have: parameters p; p.feeds.all = true; std::ofstream ofs("test_parameters.xml"); assert(ofs.good()); boost::archive::xml_oarchive oa(ofs); oa << BOOST_SERIALIZATION_NVP(p); It compiles, links and executes well, the file test_parameters.xml is created ... but empty ! What am I doing wrong? Hope you could help. Best regards, Olivier