Here are some additional examples from the Web of currency mixed with
measures, some of which differ from the "$__ per barrel" pattern and a
suggested new conceptualization that seems to work with them.
http://microformats.org/wiki/currency-examples#Real-World_Examples
Here is another suggested conceptualization that seems to match what's
on the Web:
$ is not a unit, $ is a currency. "Dollar" "Cent" are the units of the
"USD" currency. Just like length is not a unit, but meter and foot are.
Currency measures have a default unit (for USD, it's the dollar), that
is sometimes omitted in the representation of currency amounts.
*Example 1*
So "$25 per barrel" is really "$25 dollar per barrel", but a computer
can figure this out from:
<span class="price"><abbr class="currency" title="USD">$</abbr><span
class="value">25</span> <span class="unitdivider">per</span> <span
class="unit" title="BLL">barrel</span></span></span>
BLL is the UNECE code for barrel. See
http://microformats.org/wiki/measure-formats#UNECE
*Example 2*
"25 (USD per barrel)" is really "25 $ dollar per barrel", "$" is the
currency, "dollar per barrel" is the unit but a computer can figure this
out from:
<span class="price">25 (<abbr class="currency" title="USD">USD</abbr>
<span class="unitdivider">per</span> <span class="unit"
title="BLL">barrel</span>)</span>
*Example 3*
Similarly in "$150K per year" the currency is "$" but the "unit is
thousands of dollars per year", but the computer can figure it out from:
<span class="salary"><abbr class="currency" title="USD">$</abbr>150<abbr
class="unitmultiple" title="1000">K</abbr> <span
class="unitdivider">per</span> <span class="unit"
title="ANN">year</span></span></span>
ANN is the UNECE code for year. See
http://microformats.org/wiki/measure-formats#UNECE
Let me know what you think. I'll put this on the wiki later.
Guillaume
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