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

If all nested constraints return true, that is the result. Otherwise, the result will be false.

Pessimistic 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 only if their name and addresses match with
  // a "true" tolerance, not an "uncertain" one
  equivalence: pessimistic-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)
  }
}