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   RE: [xml-dev] RDDL and user interface

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Eric Hanson wrote:
> One thing to note is that RDDL is centralized; the descriptor is
> stored at the namespace URI.  It's designed to point to schemas
> and other things that go along with making a namespace, so
> having it controlled by the namespace owner is fine in this
> context.  In the application domain though, third parties should
> be able to write a handler for a type of data without having to
> work with the namespace owner to add it to their RDDL file.

Although it is convenient to store a RDDL file so that it will be 
returned on dereferencing a namespace URI (i.e. store the RDDL document 
"at" the namespace URI) this is not necessary. RDDL is a *language* and 
RDDL documents might be stored *locally* ... for example add a 
reference to the local file in an XML catalog.

It is true that it is *designed* to be suitable as a format to return 
on dereferencing a namespace URI, but this does not make RDDL 
centralized ... hardly ...

On the other hand if you really want to disassociate information about 
namespace URIs from mechanisms used to dereference the URI e.g. DNS 
HTTP etc, RDF is an excellent choice.



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