[Rails] Re: XML or YML?

chewmanfoo wrote:
> If it's immutable, then why is it in a database?

What he's saying is that it is "immutable" by policy. If you have a
database that stores orders where each order contains an order number
(not a primary key, but rather a number given to a customer), by policy
that order number should never change. If it did you would lose track of
the order.

This has nothing to do with position in the database. Order number is
simply a reference to one specific order. A reference that *must* be
immutable and atomic.
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