Replying to Looking For An Open Fileformat

We're developping in Windows, but our assignment has changed (again).
They've decided we have to build a Google Sketchup add-in and export the map as SVG and Collada file.

Thanks anyway

Hi
I'd be happy to answer that question if you tell me the operating system (Mac, Linux, Unix, or Windows)
Bye
P.S. Hope I can help

For school we're looking for a usable fileformat that we can use to do the following:

• Building environments (eg. airport, office building, ...)
• Give ID's or classes to certain spaces (eg. only authorised personel can enter a room, or a bus isn't able to enter a place, ...)
• It must have a well defined origin (since we'll be working with localisation, we'll have to use that origin)
• It must be open and usable in C++/Qt in some sort

Atm we've had DWG (but that's to complex + we should use colors as a replacement for classes), 3DMWL (it's to immature and to weak) and SVG (don't know why our promotor didn't like it ... it seems okay for me, but he doesn't want it ) and atm I'm looking at Collada.

So, anyone has an idea ?

Let me know