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A join that only returns false or true, treating values that would be uncertain as true.

If any nested constraint returns false, that is the result. Otherwise, the result will be true.

Optimistic joins can be made conditional by wrapping their constraints in if blocks.

Examples

structure (Business) {
  property (address) {
    type (viv.geo.Address)
  }
  // ... more properties ...
  // Businesses get merged if their name and addresses match in a fuzzy
  // way with an "uncertain" tolerance:
  equivalence: optimistic-join {
    convertible-concepts
    equivalent-values (name)
    equivalent-values (address)
  }
}

This block demonstrates a conditional constraint:

equivalence: optimistic-join {
  equal-values (label)
  equivalent-values (performer)
  equivalent-values (venue)
  if (label == 'SingleEvent') {
    equivalent-values (events)
  }
}