std.xml should just go

[so]

> Examine the API of a function in a library. It says it doesn't modify  
> anything reachable through its arguments, but is that true? How would  
> you know? And how would you know if the API doc doesn't say?

You are right, but try to look at this from another angle (probably i am  
not making any sense here). Should "D const" be perceived this way?
When i say "const A", it broadly means don't assign to this.

> You'd fall back to const by convention, and that is not reliable and  
> does not scale. You have to manually go through an entire hierarchy of  
> function calls to figure out if one might change a member of the data  
> structure, and then after a few maintenance cycles, you have to do that  
> all over again.

I have no idea how to solve this for documentation and such but the second  
you compile the source, everything will be clear as day.