In message <[EMAIL PROTECTED]>, Guillaume Lebleu
<[EMAIL PROTECTED]> writes
IMO, we must conceptually distinguish the notion of *money amount* and
the notion of *price*. A money amount is an amount of a given number of
units of currency. A price is an equivalence relationship typically
between a money amount and another amount in any measurement unit. Some
prices are expressed without using currencies. Some prices are prices
of one currency in another one (as in 1 euro = 1.41 dollars).
The amount+unit is not a relation and does not change over time, and
does not have to be dated.
A price does change over time, and should be dated.
In Andy's example above, the date is not a property of the "hmoney"
class, but of a TBD "hprice" class.
I don't see any advantage in making such a distinction, nor any problem
in not doing so,
Perhaps you could enlighten me, with real-world published examples?
--
Andy Mabbett
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