public GroupCharacteristicComponent copy() {
GroupCharacteristicComponent dst = new GroupCharacteristicComponent();
copyValues(dst);
dst.code = code == null ? null : code.copy();
dst.value = value == null ? null : value.copy();
dst.exclude = exclude == null ? null : exclude.copy();
dst.period = period == null ? null : period.copy();
return dst;
}
