a little late, but better late then never I'm reviewing the Spec proposal. So I might have some other points I like to should to the round by topic.
Paragraph 2.3 mentions:"Since such exchange rates may change during time, historization must also be supported by such rates."
I think historization is not only needed because of the rates. I see a big potential that especially in this area it might happen that changes directly on the currency itself will be introducted (BTW: see also ISO standard for denomination etc.). So would it not be worth to mention this in the spec?
And I think rates are always very time bound not only in virtual world as also mentioned in section 2.5 of the spec ;-).
Or do I got something wrong.
-- Sascha Freitag Hofstattstr. 14 9602 Bazenheid Tel:+41 71 222 2042 Mobile:+41 79 752 4200
[JSR-354] Not only rates have a historization aspect