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How to represent a "cost" in XML?

Hi Folks,


I would like to represent in XML the cost of something.


Here’s one way to represent it:


<Cost currency="USD">8.95</Cost>


If you didn’t want to use attributes (or mixed content), how would you represent it?


Would you represent it like this:




I do not like that representation because it introduces a fake <Value> element.


Perhaps you would represent it by turning things inside out:




I’m not sure I even know what that means.




Any economists out there? Please do tell: what is “cost”?


Cost seems to have (at least) two components: a number and an indication of what system of money the number is based on. The “system of money” is the currency. What about the number; what is it? What label do you give to the number? When you talk about the number, what words do you use?



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