Do we still need URN subclassifications.

[peterbrightwell]

This came up in review for proposed v1.3.1

2.1. APIs - Common Keys.md mentions possibly using future format subclassifications such as urn:x-nmos:format:video.raw. Should this be removed/deprecated, as in practice we use IANA media_type?

[peterbrightwell]

Are there any examples of other subclassifications that are actually used that would be more suitable here? Is the .ucast / .mcast example used in practice?

[garethsb]

Yes it is (though causes pain, e.g. Query API Basic Query for transport=urn:x-nmos:transport:rtp doesn't return the subclassifications because it uses exact string match)

[peterbrightwell]

We made further improvements for v1.3.1 release. See #166