Reference to a resource (by instance)

An identifier or code by which the ingredient can be referenced

A classification of the ingredient identifying its purpose within the product, e.g. active, inactive

A classification of the ingredient identifying its precise purpose(s) in the drug product. This extends the Ingredient.role to add more detail. Example: Antioxidant, Alkalizing Agent

Reference to a resource (by instance)

The product which this ingredient is a constituent part of

Reference to a concept (by class)

The organization that manufactures this ingredient