- unoff => 'di-rare', # unofficial
- wd => 'di-b', # draft
- pr => 'di-prop', # proposed
- cr => 'di-d', # candidate
- rec => 'di-a', # recommendation
- ietf => 'di-aa', # standard
+ unoff => 'ex', # unofficial
+ wd => 'l0', # draft
+ pr => 'l2', # proposed
+ cr => 'l4', # candidate
+ rec => 'l5', # recommendation
+ ietf => 'l6', # standard