C14n before XPath (Re: Enveloped signatures and XPath)

> Do we need to recommend that Canonical XML transform be used before
> the Xpath? (Or do we assume the processors use Canonical XML (or some
> other  method (e.g., DOM)) consistently to accomplish this?)
> 
> <john>
> I don't think we need to recommend using c14n before Xpath.  According to
> Tamura Kent, it doesn't do any good anyway.  According to the XPath spec,
> all expression evaluation occurs based on UCS code point values, so
> everything is supposedly transformed to the 'character domain'
> automatically.

Right.  XML C14N is a method to represent infomation-set in
octet stream.  It never modify information-set (DOM), and XPath
evaluators use only information-set.

-- 
TAMURA Kent @ Tokyo Research Laboratory, IBM