No, standards-body is in use, actually, so use it in Defined by.
Rather painful checkpoint, in deriving ref. dist from ref. impl.
Broken checkpoint, but inching towards glorious orthogonality!  Sure.
Attempt to update description of ref. dist. in schema.
We ought to be able to derive this; not used in templates anyway.
Begin replacing `reference-distribution` with `defining-distribution` where necessary.
Get rid of `reference-distribution` field entirely.
Kill non_ref_dist_implementations and 'Contained Implementations'.