It is my understanding only when the fb app is set to FBML will it process the <fb tags.
However, in the examples for IFrame, both show the usage of <fb tags like <fb:name and <fb:Wall.
In the Login iframe example it encloses the tags with a <fb:Fbml set, but either way while the api calls in the example work, none of the fb tags are translated and just render out as themselves.
My question is for an IFrame app, what is supposed to be the intended behaviour and usage of the <fb tags?
I am not sure if I am doing something wrong or if it is the correct behaviour.