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The roles identified above extend the ingredient class, with the codes expressed as a controlled vocabulary with code elements mapped to them. Figure 2, below, shows how the codes map to some of the roles, and how the model for ingredient corresponds to Figure 12 from the IDMP standard. Each of the roles specified in the IDMP standard will be subclasses of ingredient, signified by the proper code, and additional semantics for those roles, such as the connections to reference substances can be modeled directly for those roles that require that link in the graph. Elements in white are classes in the ontology. Elements in blue are instances, in this case, of codes.

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Figure 4, below, provides a partial example (with some details elided) of the representation of a chemical substance as an active ingredient with its strength. This example is also encoded in the set of examples provided with the ontology. Note that the elements in white are classes in the ontology. Elements in blue are instances of those classes, and in purple are literal values.

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