RE: Excess URI schemes considered harmful

>> I agree, but this seems very different from the mapping proposed by
>> RFC 3023 [1] which defines a mapping from a (namespace) URI into a 
>> content type based on an IANA registration and a new "+xml" syntax 
>> convention for XML based content type names.
>
>Where does 3023 propose such a mapping?

Through the central registration process. This is for example how the
"http://www.w3.org/2000/svg" namespace identifier identifying the SVG
language is proposed to be mapped into "image/svg+xml". This is of
course not an automatic mapping but a mapping nonetheless.

Henrik