Enumerations for _Constraint_file.Constraint_subtype (An open enumeration) 
alignment tensor enumeration_text 
chirality enumeration_text 
disulfide bond enumeration_text 
general distance enumeration_text 
hydrogen bond enumeration_text 
NOE enumeration_text 
NOE buildup enumeration_text 
NOE not seen enumeration_text 
Not applicable enumeration_text 
peptide enumeration_text 
prochirality enumeration_text 
ring enumeration_text 
ROE enumeration_text 
symmetry enumeration_text