has prototype heart SubClassOf 'has prototype' some ('participates in' some 'blood circulation') This property can be used to make weaker forms of certain relations by chaining an additional property. For example, we may say: retina SubClassOf has_prototype some 'detection of light'. i.e. every retina is related to a prototypical retina instance which is detecting some light. Note that this is very similar to 'capable of', but this relation affords a wider flexibility. E.g. we can make a relation between continuants. 'human p53 protein' SubClassOf some ('has prototype' some ('participates in' some 'DNA repair')) Chris Mungall x has prototype y if and only if x is an instance of C and y is a prototypical instance of C. For example, every instance of heart, both normal and abnormal is related by the has prototype relation to some instance of a "canonical" heart, which participates in blood circulation. Experimental. In future there may be a formalization in which this relation is treated as a shortcut to some modal logic axiom. We may decide to obsolete this and adopt a more specific evolutionary relationship (e.g. evolved from) TODO: add homeomorphy axiom independent continuant process pending final vetting