show_duration(f, dive->duration, " <duration>", "</duration>\n");
show_duration(f, dive->surfacetime, " <surfacetime>", "</surfacetime>\n");
show_pressure(f, dive->beginning_pressure, " <cylinderstartpressure>", "</cylinderstartpressure>\n");
show_duration(f, dive->duration, " <duration>", "</duration>\n");
show_duration(f, dive->surfacetime, " <surfacetime>", "</surfacetime>\n");
show_pressure(f, dive->beginning_pressure, " <cylinderstartpressure>", "</cylinderstartpressure>\n");