data_non_numeric
_cell_length_a                   'not measured'
_cell_length_b                   3(none)
_cell_formula_units_z            none
_publication_year                unknown
_diffrn_radiation_wavelength     time-of-flight
_refine_ls_r_factor_obs          small
_cod_duplicate_entry             'none found'

data_non_numeric_inf
_cell_length_a                   inf
_cell_length_b                   +inf
_cell_length_c                   -inf
_cell_measurement_temperature    infinity
_diffrn_ambient_temperature      +infinity
_diffrn_radiation_wavelength     -infinity

data_non_numeric_nan
_cell_length_a                   NaN
_cell_length_b                   +nan
_cell_length_c                   -naN

data_signed
_cell_length_a                   -5
_cell_formula_units_z            -2
_publication_year                -10
_diffrn_radiation_wavelength     -5000
_cod_duplicate_entry             -1

data_overflow
_journal_coeditor_code           'a very long code'
_journal_issue                   'a value clearly too long'
