I don't think Lorenzo is talking of: *currency amount per item/product*
as your title and example imply (that, I agree, is a non-starter)
but of *currency amount per unit of measurement* (which is widely used -
see for instance: http://www.bloomberg.com/energy/, although not in the
context of a house/product/job in which case the unit is obvious).
In "$25 per barrel" or in "25 ($/bbl)", I think you would agree that
knowing that the barrel is the unit of measurement is very significant,
and even though knowing that "$" means USD dollars, overlooking that it
is a price per barrel would lead to a big mistake.
I think Lorenzo is furthermore suggesting that a currency is just
another unit. I agree conceptually that it is, but in practice, standard
bodies (that I know of) have traditionally separated currency amounts
from other measures. For instance, I took a look at the UNECE
recommended codes for units of measurement (reused by some industry
standards), available at:
http://www.unece.org/cefact/codesfortrade/codes_index.htm.
http://www.unece.org/cefact/recommendations/rec20/rec20.zip. They indeed
have the barrel (US) as a well-known unit, but as I mentioned UNECE does
not include currencies in their list of units of measurement.
Which leads me to my updated code examples.
<span class="price"><abbr class="currency" title="USD">$</abbv><span
class="value">25</span> <span class="unit" title="BLL">per
barrel</span></span>
<span class="price"><span class="value">25</span> <abbr class="currency"
title="USD">$</abbv><abbr class="unit" title="BLL">/bbl</abbr></span></span>
<span class="price">On <abbr class="datetime"
title="1998-03-12T08:30:00-05:00">August 1</abbr>, the US Dollar still
stood at <span class="value">643 <abbr class="currency"
title="DEM">Marks</abbr></span> to the <span class="unit currency"
title="USD">Dollar</span>.</span>
The following rules should be used:
* If "value" is not present, then value = 1.
* "unit" is optional
By the way, I haven't found any measurement microformat on the wiki, so
maybe we could do the currency+measurement at the same time.
Let me know what you think.
Guillaume
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