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I have updated the draft, to appear soon. Changes done: - There are now two reference implementations, one based on vectors and the other on closures. - The reference implementation has been simplified a lot (although it is still complex syntax-rulesery, I know). - I have removed the variants label and (label) for the field specs as Alex asked, but I have kept immutable fields - sorry Alex. - changed record-update. to record-update* - rearranged order of record and type for the updates. - renamed record-extend to record-compose. Record-compose does not require the export type to be a subtype of the import types any longer. See example. Regards Andre