output = Xapian::Query (Xapian::Query::OP_VALUE_RANGE, NOTMUCH_VALUE_LAST_MOD,
Xapian::sortable_serialise (from_idx),
Xapian::sortable_serialise (to_idx));
output = Xapian::Query (Xapian::Query::OP_VALUE_RANGE, NOTMUCH_VALUE_LAST_MOD,
Xapian::sortable_serialise (from_idx),
Xapian::sortable_serialise (to_idx));