optimistic-join
optional
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)
}
}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 |