Re: duplicate declarations

> See
> 
>  http://relaxng.org/compact.html#nt-decl
> 
> Specifically the "duplication declaration" and "xsd prefix"
> constraints.  Both these things are not allowed.
> 

OK, is it valid to explicitely assign the same URI to xsd datatypes prefix?
I am asking  because many sample grammars, including grammar for rng in the compact
syntax contain explicit declaration of xsd datatypes prefix, while my understanding
of the specification is that it is not allowed.

David