RE: Summing up on visibility(?)

+ 1. 
This point will become more difficult to refute when SOAP matures and
the headers become standard and non-ambiguous. 

> it seems to me 
> that XML supports "visibility" because 3rd party tools, 
> intermediaries, etc. can extract useful information for 
> routing, cacheing, security, etc. without truly 
> "understanding" what's going on.  That's the same kind of 
> advance that HTTP offered over raw IP messages as far as 
> these things were concerned.  Time marches on.  
>