[WF-Protocols] first attempt with xml schema

[Anders Stenberg]

Andor Holtsmark wrote:

>In modelling the word vertex is always used to describe points in space
>which are used to build faces/polygons.
>
>I'd avoid using nodes, as node is an ambiguous term
>
>munin
>  
>
I agree on avoiding "node". The thing I meant from the beginning is that 
"vertex" is commonly used both for just the position, _and_ the whole 
"package" of position, texture coordinates, etc. I think that's a bit 
confusing sometimes (at least when talking about it, it's hard to know 
which of the two meanings people mean). But maybe it's not confusing 
enough to be an issue at all. :)

/Anders Stenberg