node->add_property (X_("id"), buf);
node->add_property (X_("flags"), enum_2_string (_flags));
snprintf (buf, sizeof (buf), "%2.12f", get_value());
node->add_property (X_("id"), buf);
node->add_property (X_("flags"), enum_2_string (_flags));
snprintf (buf, sizeof (buf), "%2.12f", get_value());