Anyone uses Oanda as a webservice for your system exchange rates?

I need them to supply me with the XML specification of their feed, so I can build a proxy on my end and enable their service as a supported service on our application. Our customers will then be able to subscribe to Oanda's feed if they so wish, knowing our application supports it.

I've sent two emails already with absolutely no response from Oanda on this matter. They either (for some strange reason) do not want to divulge the XML specification, or simply don't care.

Anyone ever managed to get something from these folks? Or has it been like this with you too?