Enumerations for _Data_set.Type (A closed enumeration)
`assigned_chemical_shifts` | enumeration_text
`binding_constants` | enumeration_text
`conformer_family_coord_set` | enumeration_text
`coupling_constants` | enumeration_text
`CSA_CSA_cross_correlation_relaxation` | enumeration_text
`deduced_hydrogen_bonds` | enumeration_text
`deduced_secd_struct_features` | enumeration_text
`D_H_fractionation_factors` | enumeration_text
`dipolar_couplings` | enumeration_text
`dipole_CSA_cross_correlation_relaxation` | enumeration_text
`dipole_dipole_cross_correlation_relaxation` | enumeration_text
`dipole_dipole_relaxation` | enumeration_text
`general_relaxation` | enumeration_text
`heteronucl_NOEs` | enumeration_text
`heteronucl_T1_relaxation` | enumeration_text
`heteronucl_T1rho_relaxation` | enumeration_text
`heteronucl_T2_relaxation` | enumeration_text
`H_exch_protection_factors` | enumeration_text
`H_exch_rates` | enumeration_text
`homonucl_NOEs` | enumeration_text
`molecular_axis_determinations` | enumeration_text
`order_parameters` | enumeration_text
`other_data_list` | enumeration_text
`pH_NMR_param_list` | enumeration_text
`pKa_value_data_set` | enumeration_text
`RDCs` | enumeration_text
`representative_conformer` | enumeration_text
`spectral_density_values` | enumeration_text
`spectral_peak_list` | enumeration_text