What file format would I use for currency exchange

Question

I'm looking for a standard file format that used by systems needing to store currencies and also provide currency exchange (so we need both the buy and sell rates)

I looked online and found the .cex but have not been able to find it's format.

Where do I get the format of this file?

Is there another file format I should use?

Answer 1

I don't know if SERIFF is any better for your application, but at least it has documentation.

Answer 2

Or maybe FIX is what you're after.

Answer 3

FpML http://www.fpml.org/ might be what you're looking for. If all you are doing is storing bid/ask then I don't think I'd saddle myself with XML. What's wrong with storing it in a database?