data_nan_year
_publ_author_name               'Tester, Software'
_space_group_name_H-M_alt       'P 1'
_space_group_name_Hall          'P 1'
_journal_name_full              'Fake journal used for CIF software testing purposes'
_publ_section_title             'Fake title used for CIF software testing purposes'
_journal_year                   NaN
_journal_volume                 1970
_journal_page_first             1
_cell_formula_units_Z           1
_cell_length_a                  5
_cell_length_b                  5
_cell_length_c                  5
_cell_angle_alpha               90
_cell_angle_beta                90
_cell_angle_gamma               90
_chemical_formula_sum           H
loop_
_space_group_symop_id
_space_group_symop_operation_xyz
1 x,y,z
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
H H 0.5 0.5 0.5

data_not_a_number_year
_publ_author_name               'Tester, Software'
_space_group_name_H-M_alt       'P 1'
_space_group_name_Hall          'P 1'
_journal_name_full              'Fake journal used for CIF software testing purposes'
_publ_section_title             'Fake title used for CIF software testing purposes'
_journal_year                   not-a-number
_journal_volume                 1970
_journal_page_first             1
_cell_formula_units_Z           1
_cell_length_a                  5
_cell_length_b                  5
_cell_length_c                  5
_cell_angle_alpha               90
_cell_angle_beta                90
_cell_angle_gamma               90
_chemical_formula_sum           H
loop_
_space_group_symop_id
_space_group_symop_operation_xyz
1 x,y,z
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
H H 0.5 0.5 0.5

data_numeric_prefix_year
_publ_author_name               'Tester, Software'
_space_group_name_H-M_alt       'P 1'
_space_group_name_Hall          'P 1'
_journal_name_full              'Fake journal used for CIF software testing purposes'
_publ_section_title             'Fake title used for CIF software testing purposes'
_journal_year                   1970-not-a-number
_journal_volume                 1970
_journal_page_first             1
_cell_formula_units_Z           1
_cell_length_a                  5
_cell_length_b                  5
_cell_length_c                  5
_cell_angle_alpha               90
_cell_angle_beta                90
_cell_angle_gamma               90
_chemical_formula_sum           H
loop_
_space_group_symop_id
_space_group_symop_operation_xyz
1 x,y,z
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
H H 0.5 0.5 0.5
