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Re: Namespaces and DTDs

• From: Andrew McNaughton <andrew@s...>
• To: Marc.McDonald@D...
• Date: Fri, 12 Mar 1999 15:41:29 +1300

Documents resulting from queries run on the concatenated document would tend 
to cause problems, as query results don't generally return the context of the 
XML elements returned.  This problem also applies to queries run across 
multiple documents unless their DTD's are identical, which perhaps suggests 
that an answer to this problem has to come from the query languages.

Andrew McNaughton



 Marc.McDonald@D... wrote:
> So make a namespace declaration a PI and add an "not using this 
> namespace anymore" PI. Then use simple occurrence scoping:
> 
> Process result:
> <?XMLNS prefix="foo" uri="...">
> <A> .... </A>
> <XMLENDNS prefix="foo">
> 
> Process gets to define the prefixes that override any previous 
> definition, old definition (if any) restored by XMLENDNS. No problem 
> with concatenation.
> 
> 
> Marc B McDonald
> Principal Software Scientist
> Design Intelligence, Inc
> www.design-intelligence.com
> 
> 
> ----------
> From:  David Megginson [SMTP:david@m...]
> Sent:  Thursday, March 11, 1999 11:30 AM
> To:  XML Developers' List
> Subject:  Re: Namespaces and DTDs
> 
> Charles Reitzel writes:
> 
>  > Seriously, though.  I have yet to hear of a single real 
> application
>  > that needs element level prefix declarations.  Not one!
> 
> I'll paraphrase the use case as follows (I'll leave the source
> anonymous):
> 
>   A server wants to construct a large XML document as the response to
>   a client request, and it does so by handing off the work to several
>   parallel processes and then concatenating the results into a single
>   document.  If each of the processes can declare its own namespaces,
>   then it is not necessary to establish complicated negotiation
>   channels between the top-level process and the child processes to
>   obtain the correct namespace declarations.
> 
> Before everyone rushes out to shoot holes in this use case, I'd like
> to note that I still have callouses on my trigger finger from doing 
> so
> myself.
> 
> 
> All the best,
> 
> 
> David
> 
> --
> David Megginson                 david@m...
>            http://www.megginson.com/
> 
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-- 
-----------
Andrew McNaughton
andrew@s...
http://www.newsroom.co.nz/



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