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Re: XPointer crisis

• To: Heikki Toivonen <heikki@n...>
• Subject: Re: XPointer crisis
• From: Daniel Veillard <veillard@r...>
• Date: Fri, 1 Feb 2002 15:20:15 -0500
• Cc: xml-dev@l...
• In-reply-to: <3C5AF6B8.5090807@n...>; from heikki@n... on Fri, Feb 01, 2002 at 12:12:40PM -0800
• References: <1012587257.27106.38.camel@l...> <p05100303b8807575e600@[192.168.155.106]> <1012587257.27106.38.camel@l...> <20020201123611.D29819@r...> <5.1.0.14.0.20020201134448.029015c8@157.189.161.214> <20020201144101.E29819@r...> <3C5AF6B8.5090807@n...>
• Reply-to: veillard@r...
• User-agent: Mutt/1.2.5.1i

On Fri, Feb 01, 2002 at 12:12:40PM -0800, Heikki Toivonen wrote:
> >  Whose semantic is hardcoded in a DTD that nearly no application
> >ever respected or used. Let's have a look of the alternatives in
> >XML:
> >
> >  #foo
> >
> >  Hard to rely on it with XML, well last time I suggested on this forum xml:id
> >I got a lot of flack back, I won't try again.
> >  So either you accept to force validation of document (and hence
> >possibly have to fetch and trust remote DTD in your framework) or you
> >need other pointing schemes.
> >
> This isn't as hard as you'd think. You can have non-validating parser 
> pay attention to ID type attributes.
> 
> In some cases you may author your document so that it contains an 
> internal subset specifying the ID type attributes.

  Seriously I have yet to see a single document with an ID attribute
redefinition in the internal subset.

> Your application may also support some kind of catalog system (a la XML 
> Catalog) so that it could load a local DTD file instead of a remote DTD.

  This require prinstallation. It's a limited context, really ... I'm
fighting at the moment to have just the DocBook DTD and default
stylesheet registered in the XML Catalog of Linux distributions, and
it's not a done deal. Probability it would work on a random XML
fetched on the web is damn close to 0. Not reliable, and you want pointing
to be reliable
  
> Finally your application may have hardcoded support for some document 
> types/schemas/namespaces, and may be able to recognize ID attributes 
> because of that (take XHTML for example).

  Hardcoded :-(
  Let's not repeat the HTML disasters, thanks !

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/

• References:
  • Re: XPointer crisis
    • From: "Simon St.Laurent" <simonstl@s...>
  • XPointer crisis
    • From: "David G. Durand" <david@d...>
  • Re: XPointer crisis
    • From: Daniel Veillard <veillard@r...>
  • Re: XPointer crisis
    • From: Jonathan Robie <jonathan.robie@s...>
  • Re: XPointer crisis
    • From: Daniel Veillard <veillard@r...>
  • Re: XPointer crisis
    • From: heikki@n... (Heikki Toivonen)

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