[uf-discuss] Dated currency examples?

Guillaume Lebleu gl at brixlogic.com
Wed Sep 27 11:55:21 PDT 2006

Sorry if I'm only getting up-to-speed on this debate.

I agree that attaching explicitly date/time information directly to a 
currency value is relatively rare, and when necessary that it is usually 
inferred from the context.

For instance, we talk of the date of the price of a barrel of oil, in 
which case the date/time is attached to the "price" component of a 
"product", the "currency value" being only one expression of the 
"price". See Andy's example: http://news.bbc.co.uk/2/hi/business/1096916.stm

On the other hand, I think attaching date/time information to *currency 
rates* is very common (See Andy's example: 

Moreover, even though a currency rate is the "price" of a "product", it 
is particular enough that it deserves its own class.

Taking one of Andy's examples that deals with currency rates, and 
reusing both the abbr/date pattern used in hCalendar and some he IFX/OFX 
semantics, I think we could get away with:

<span class="currencyrate">On <abbr class="datetime" 
title="1998-03-12T08:30:00-05:00">August 1</abbr>, the <abbr 
class="currency" title="USD">US Dollar</abbr> still stood at <span 
class="currencyamount">643 <abbr class="unitcurrency" 
title="DEM">Marks</abbr></span> to the Dollar.</span>


    * currencyrate
          o currency
          o currencyamount
                + unitcurrency

Another attempt with the oil barrel example:

<span class="price"><span class="currencyamount"><abbr 
class="unitcurrency" title="USD">$</abbr>25</span> a <abbr class="unit" 


    * price
          o currencyamount
                + unitcurrency
          o unit

Of course, this is just brainstorming, as I am just getting started with 


Scott Reynen wrote:
> In the currency-brainstorming [1] page, I see a few straw man 
> proposals with dated currency.  But I don't see anything in 
> currency-examples [2] with dated currency.  I think I understand the 
> general idea, that currencies change value over time, but in what 
> currently published HTML would such date markup be used?  I'm sure 
> there are examples of dated currency published on the web, but I 
> suspect they are far under 20% of the currency values published.  I'm 
> interested in seeing this microformat completed and adopted and I'd 
> hate to see unnecessary complexity prevent that from happening.
> [1] http://microformats.org/wiki/currency-brainstorming
> [2] http://microformats.org/wiki/currency-examples
> Peace,
> Scott
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