In other words, the way we can use the Gold Book as a source for textual definitions in chemical ontologies depends on the expressivity of the ontology into which we need to map the expertise provided in the Gold Book. In cases where we only need or want to define hierarchies, e.g. when building SKOS thesauri or in the early stages of ontology development, bringing the Gold Book definition of a term into an Aristotelian structure will most likely suffice and it can otherwise be reused rather verbatim. In cases where more expressivity and thus axiomatization is required, the need to use multiple related concepts and paraphrase Gold Book definitions will likely be higher and dependent on the complexity and term labels of the formal ontological context into which one maps.