| Indicates the primary composition of a substance in terms of another substance. Note that the semantics of this relationship means that it cannot be a sub property of the 'isPartOf' relationship. The reason for this concerns the transitive composition of things in terms of the isPartOf relationship: if X isPartOfY and Y isPartOf Z, then X isPartOf Z. In the case of the current relationship this semantic interpretation is no longer valid. |
| owl:ObjectProperty |
| owl:InverseFunctionalProperty |
| Inverse Functional |