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join

optional

Evaluates constraints and determines whether to return false, uncertain, or true, depending on the result.

If any nested constraint returns false, that is the result. Otherwise, if any nested constraint returns uncertain, that is the result. The result is true if and only if all the nested constraints return true.

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

Examples

This equivalence block compares two latitude and longitude values in a GeoPoint, specifying values for equivalence and uncertainty.

structure (GeoPoint) {
...
equivalence: join {
fuzzy-numeric-equality (latitude) {
true-tolerance (0.00005)
uncertain-tolerance (0.005)
}
fuzzy-numeric-equality (longitude) {
true-tolerance (0.00005)
uncertain-tolerance (0.005)
}
}
}

This block demonstrates a conditional constraint:

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

Child Keys

fuzzy-numeric-equality
optional
Constraint that relaxes the equivalence threshold for float values (primitive type decimal)
fuzzy-string-equality
optional
Constraint that relaxes the equivalence threshold for strings (primitive type name)
inherit-predicates
optional
Inherit the equivalent policy from a parent concept
never-equivalent
optional
Never set types equal to each other