currency-examples

Currency Examples

The following are real-world examples and brainstorming for marking up currency.

The Problem

The problem: how to explicitly specify a) that a figure/number relates to money; and b) the currency of a stated figure.

• The currency sign cannot be used reliably since the same sign (or symbol) may represent more than one currency. eg. $ is used for many different dollars (USD, AUD, CAD...) and even other units like pesos.
• The language of the page is not sufficient to define the currency of prices in the page:
  • More than one currency may be used by people who speak the same language.
  • The page may be written in one language and still quote prices/figures in a different country's currency.
  • Even if a country can be identified, more than one currency may be used in that country.

Converting currency figures is a reasonably easy problem to solve as indicated by the #Existing_Practices. However many automated conversion tools must make assumptions about the original figure's currency - eg. assuming a USD for all uses of $, or British Pounds for £ (which is also sometimes used to denote Lira).

Related problems

"Amounts" in arbitrary units is a bit harder and necessary for several applications.

For example, consider the work that has been done on a recipe microformat.

recipe-examples

Though we haven't reached this problem yet in the research, I can see it coming:

Say you wanted to create a "shopping list" application which you could tell which recipes you wanted to cook, and have it automatically total up all the various amounts of ingredients and give you the net amount of stuff you wanted to pick up.

It would need to be able to determine precise amounts/units of each ingredient. This might turn out to be like the currency problem, or it might be more complex, given the variety of units used in recipes, English vs. metric etc. That's a case that might need a microformat. We need more research and analysis to really justify it, but I can see it within the realm of probable possibility.

Participants

• Ben Buchanan
• Charles Iliya Krempeaux
• Ben Ward
• Arve Bersvendsen
• Mike Stickel
• Ciaran McNulty
• Tantek Çelik
• Steve Ganz

Real-World Examples

Links to public web pages, either popular or insightful

McAfee

<span class="price">$39.99 <span class="currency">(USD)</span></span>

Amazon

<td class="price">$34.85</td>

Bell Canada in French Canadian

<font size="larger"><b>Niveau de service Premium - 125 $*</b></font size>

Note the placement of the dollar sign AFTER the number.

Bell Canada in US English

<font size="larger"><b>Premium Service Level - $125*</b></font size>

Existing Practices

Firefox Extension

Firefox Currency Converter - ViewMyCurrency

Note: the current bug list illustrates some problems of identifying currencies based on page content alone:

• All $ symbols are treated as USD Very annoying if you are Australian, Canadian etc. (Needs a new feature)
• ‘Euro 2006 Championship’ should not be converted.
• ...
• Don’t convert CVS keywords . $Revision: 1.3 $ should not be treated as dollars.

Greasemonkey Scripts

Exchequer

Yahoo! Finance Currency Converter

Relevant Standards

ISO 4217 Codes

See Also

• currency-brainstorming
• abbr-design-pattern