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Re: Registered Namespace prefixes


unicity point
On Fri, Mar 07, 2003 at 06:20:31PM -0500, Gavin Thomas Nicol wrote:
> On Friday 07 March 2003 04:37 pm, Daniel Veillard wrote:
> Now, to say that Jabber needs namespaces in order to handle arbitrary content 
> is simply specious at best. The examples I see from Jabber are things like 
> this:
> 
>   <iq type='set' to='responder@c.../jrpc-server' id='1'>
>     <query xmlns='jabber:iq:rpc'>
>       . . .
>     </query>
>   </iq>

  There is also (or were when I looked last year) elements allowing
any kind of extensions (in iq, it was <x> IIRC), i.e. allowing
to plug XML-RPC, XHTML or SMIL or anything else the sender may wish
to propagate at that point. In a message bus kind of use that 
flexibility is critical.

> > > Second, how do namespaces help?
> >
> > To identify the processing module handling a given element in the stream
> 
> Sure... a dispatch mechanism... an *application specific* dispatch mechanism. 
> How do you specify the binding between the namespace and the code that get's 
> executed? In a config file? The namespaces don't help here except to provide 
> *a* means for specifying the binding, kind of like UUID's in the Windows 
> registry. Personally, I think it quite silly to constrain an application to 
> dispatch on namespaces alone. That's just another form of tight binding... 

  tight in coupling, but very flexible and relatively safe (from an unicity
point of view).

> > Avoiding clashes unicity. I don't want to enter that debate wether
> > thay are the right tool they are the available tool.
> 
> Not *the* available tool, *an* available tool... and, FWIW, we've had prefixes 
> since *way* before namespace declarations. 

  But namespaces is the syntactic construct which is standardized for this.

> >   End of Thread from me.
> 
> If you go around making statements that imply that Jabber-like systems are 
> impossible to build without using namespaces, you should expect debate, and 
> be prepared to back up your assertion. Not everyone adheres to the dogma that 
> namespaces are a necessary evil.

  It's precisely that Thread you try to drive in and which I don't want to
enter. Maybe I came in the wrong thread, sorry my mistake I will avoid that
in the future.

Daniel

-- 
Daniel Veillard      | Red Hat Network https://rhn.redhat.com/
veillard@r...  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/

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