I took a look at the semantics used by XBRL for currency amounts (a
standard for corporate financial reporting pushed among others by the SEC).
I have made an adaptation of them in semantic XHTML:
http://microformats.org/wiki/currency-formats#XBRL (without
incorporating existing thoughts on currency, just for the sake
documenting just XBRL).
What's nice about these semantics is that:
* In XBRL, a currency is just another simple unit of measure.
* In XBRL, a unit of measure can be simple or complex. A simple unit
of measure if for instance "feet" or "Dollars" while a complex
unit of measure is "Euros per share".
* Units of measurement can be specified anywhere in the XBRL
document and assigned a unique identifier, then referred to from
numerical facts.
Here are two examples from the page. The globally defined currency
relies on an empty anchor. I don't know if anyone has an opinion about
using anchors this way.
Locally defined currency:
<span class="price">100 <span class="unit">GBP</span></span>
Globally defined currency:
<span id="u1" class="unit">GBP</span>
...
<span class="price">100<a href="#u1" rel="unit"/></span>
If we incorporate some of the patterns that seem to emerge from the
brainstorming page, we could have:
Locally defined currency:
<span class="price">100 <span class="unit currency"
title="GBP">£</span></span>
Globally defined currency:
Amounts in <span id="u1" class="unit currency" title="GBP">£</span>
...
<table>
<tr>
<td>...</td>
<td>100<a href="#u1" rel="unit"/></td>
</tr>
</table>
Let me know what you think.
Guillaume
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