* @param t The line type, should be set by the derived class constructor
*/
XLine(time_t s_time, long d, std::string src, std::string re, const std::string &t)
* @param t The line type, should be set by the derived class constructor
*/
XLine(time_t s_time, long d, std::string src, std::string re, const std::string &t)