Jackey (jack-key) is a simple define-only header that serves as an ad-hoc standard for Jack Metadata property keys. Using a single header for this coordination makes it simple to discover, use, and extend the keys used by Jack clients.
It is not necessary to use this header, since keys are defined by their URI string, but developers are encouraged to use and contribute to this header to promote interoperability in the Jack ecoystem.
There are no rules about the namespaces (e.g. domains) used for keys here, but developers SHOULD NOT define keys in others' domains, with the exception of http://jackaudio.org/metadata assuming the proposed key is not defined by Jack itself, or the master jackey.h.
-- David Robillard d@drobilla.net