Class CHEMICAL

USN: Chemicals are viewed from two distinct perspectives in the network, functionally and structurally. Almost every chemical term is assigned at least two types, one from the structure hierarchy and at least one from the function hierarchy.
Subclass-Of: Substance
Mapping: It is not true that in the Metathesurus almost every chemical term is assigned at least two types (actually: 23717 Organic-Chemical-only instances, 3413 Carbohydrate-only inst., 39748 Amino-Acid-Peptide-or-Protein-only instances, etc. In ON9.2, due to its ontology of meta-level categories, a preferential basic view should be chosen, and the structural view is at the lower (material) granularity, on which the functional (teleological) granularity depends. For this reason, Chemical-Viewed-Structurally is merged with Chemical.
Axioms:
(=> (Chemical ?Self)
    (Exists (?A)
            (And (Prime-Component ?Self ?A)
                 (Element-Ion-Or-Isotope ?A))))