From Rosetta Code

This is a semantic property.

Properties describe semantic characteristics of Rosetta Code pages, typically determined automatically from other features described in the page such as which templates are used.
This describes all capabilities which, while not directly provided by a language or its standard library, is still accessible from the language through third-party libraries, or can easily be emulated from within the language. Features which are directly provided by the language or corresponding standard library should use Property:provides instead. For libraries providing a capability, also Property:provides should be used.