This is the ValueSet that contains all the codes in RoleClassContaminantIngredient (http://terminology.hl7.org/ValueSet/v3-RoleClassContaminantIngredient) and RoleClassContaminantIngredient (http://terminology.hl7.org/ValueSet/v3-RoleClassContaminantIngredient). E.g. what you have to deal with if you get resources containing codes in either of them