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Constraint that returns true if two concept instances can be converted to each other: both instances have the same concept type (for example, they are both Business concepts), or if one is a sub-type of the other. For example, if Restaurant extends Business, then a Business and a Restaurant are convertible types. A Restaurant and a MovieTheater that both extend Business are not convertible types: they have no inheritance relationship between one other.

Example

structure (Restaurant) {
  ...
  equivalence: optimistic-join {
    convertible-concepts
    equivalent-values (name)
    equivalent-values (address)
  }
}