Michael Kay wrote:
>  
>  > There is a set of names which is named "".
>  >
>  >   [Definition:] An XML namespace is a collection of names,
>  > identified by a URI reference [RFC2396], ...
>  >
>  > The null prefix is bound to this set by default. The null
>  > prefix is the only prefix which a conforming document can
>  > bind to this namespace. In which ways is this set of names
>  > not a namespace?
>  
>  In the sense that "" is not a URI reference.
>  

I thought rfc2396, appendix c2 makes explicit allowance for it.

...

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