Custom key for use in Common Media data. Custom keys MUST carry a hyphenated prefix
to ensure that there will not be a namespace collision with future
revisions to this specification. Clients SHOULD use a reverse-DNS
syntax when defining their own prefix.
Custom key for use in Common Media data. Custom keys MUST carry a hyphenated prefix to ensure that there will not be a namespace collision with future revisions to this specification. Clients SHOULD use a reverse-DNS syntax when defining their own prefix.