NSMetadata class represents attribute-value tuples, which are objects that contain the attribute name and value of a metadata attribute.
- iOS 5.0+
- macOS 10.4+
- tvOS 9.0+
- watchOS 2.0+
Attribute-value tuples are returned by
NSMetadata objects as the results in the value lists. Each attribute/value tuple contains the attribute name, the value, and the number of instances of that value that exist for the attribute name.