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Re: [Cbor] Money amounts

Richter, Jörg <Joerg.Richter@pdv-FS.de> Mon, 25 February 2019 11:07 UTC

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From: "Richter, Jörg" <Joerg.Richter@pdv-FS.de>
To: Changaco <changaco=40changaco.oy.lc@dmarc.ietf.org>, Carsten Bormann <cabo@tzi.org>
CC: "cbor@ietf.org" <cbor@ietf.org>
Thread-Topic: [Cbor] Money amounts
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Date: Mon, 25 Feb 2019 11:06:57 +0000
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Subject: Re: [Cbor] Money amounts
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> > (I’m not a big fan of having to parse the string version of 77111, but
> if that string style is important to your application, that’s not
> relevant.)
> 
> It's not really important, I added it mostly because for some "small"
> amounts it can actually be shorter than other formats.
> 
> For example `"EUR10.00"` takes up 9 bytes whereas `["EUR", 10.00]` uses 11
> bytes when the number is encoded as a decimal fraction (tag 4).

And I'm not a big fan of encoding additional information in the number of 
decimal places.  So "EUR10.00" should be transmitted as "EUR10", or ["EUR",10].
But for other decimal fractions you are right that the string might be shorter.

Isn't this a use case for the additional attributes map?  To encode the 
number of decimal places that should be used (e.g. for display).  What
other applications do you have in mind for the attribute map?
Can some common attributes be included in the proposal?

If there is consensus I can include your extensions into my proposal for tag 165.

- Jörg

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