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Example: There is no definition of molecular graph in the ISO standards. We need to be able to incorporate that to link to Chemantics data, for example. A rough definition for molecular graph is: "The Molecular Graph is a compound concept, which represents a single chemical structure, which is normalized to conform, as much as possible, with the IUPAC specification for drawing chemical structures." The resulting skos:definition, in ISO 704 format, leveraging the definition for molecular structure is: "single chemical structure that is an unambiguous representation of the arrangement of atoms, normalized to conform with the International Union of Pure and Applied Chemistry (IUPAC) specification for drawing chemical structures to the degree possible".
Example: Properties relating a substance to other substances, and to its structure, are do not defined have explicit definitions in the ISO standards, though there are associations present in the relevant diagrams. The skos:definition, in ISO 704 format, for isRelatedSubstanceTo is simply "relates specifies a substance to another substancetarget substance with which the source has some relationship", and for hasStructure is "indicates any arrangement and/or organization of interrelated elements in a substance" at the highest level, so that it can be used generally to describe the structure of single or more complex substances.
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