Hi All, I am working with the serialization library and I made an example class like this. class Contact{ public: Contact(){} Contact(string& name, int phonenumber,long contactdate):name_(name), pnumber_(phonenumber),contactdate_(contactdate){} const string getName() const{return name_;} const long getPhone() const{return pnumber_;} const long getDate() const{return contactdate_;} private: string name_; long pnumber_,contactdate_; friend class boost::serialization::access; template<typename Archive> void serialize(Archive& ar, const unsigned int version){ ar & boost::serialization::make_nvp("name", name_); ar & boost::serialization::make_nvp("phone", pnumber_); ar & boost::serialization::make_nvp("contactdate", contactdate_); } }; Now I would like to allocate the xml file created with the use of this class in a vector, and this is the function: void getFromFile(std::vector<Contact>& contacts,const char* file){ std::ifstream ifile(file); boost::archive::xml_iarchive ia(ifile); ia >> contacts; ifile.close(); } The compiler complains because it misses a NVP wrapper for the class. I could not find an example for that in boost. Could you help me ? Thanks in advance Simone