scripts/cif_validate: tests/cases/cif_validate_018.inp data_2201319: NOTE, data item '_cell_length_a' value '1/4' violates type constraints -- the value should be a numerically interpretable string, e.g. '42', '42.00', '4200E-2'.
scripts/cif_validate: tests/cases/cif_validate_018.inp data_2201319: NOTE, missing parent data item -- the '_atom_type_symbol' data item is required by the '_atom_site_type_symbol' data item.
