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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. (A comparison of structure concepts with any missing properties will return uncertain; for more details, read about Structure Equivalence.) 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

distance-equality
optional
As a special case, we can define equivalence rules for geo.GeoPoint properties using the distance-equality constraint, which returns true if two points are within a specified geographic distance of each other
equal-concepts
optional
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
equal-values
optional
Constraint that declares that a property must be equal for the equivalence definition to return true
equivalent-values
optional
Constraint that specifies properties to use for testing structure equivalence
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