draft-ietf-appsawg-text-markdown-03 and draft-seantek-text-markdown-use-cases-00 have been posted.
The processor
parameter was removed. The parameter was renamed to the flavor
syntax
parameter, as it designates a Markdown-derivative syntax without regard to any particular implementation.
Registrations of additional syntaxes are supplied in the use-cases document. CommonMark
is one of the registrations.