public ContactPoint copy() {
ContactPoint dst = new ContactPoint();
copyValues(dst);
dst.system = system == null ? null : system.copy();
dst.value = value == null ? null : value.copy();
dst.use = use == null ? null : use.copy();
dst.rank = rank == null ? null : rank.copy();
dst.period = period == null ? null : period.copy();
return dst;
}