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Re: XML compatibility with SGML (was Re: WD for Name

• To: Seairth Jacobs <seairth@s...>
• Subject: Re: XML compatibility with SGML (was Re: WD for Namespaces 1.1)
• From: Adam Turoff <ziggy@p...>
• Date: Thu, 4 Apr 2002 09:54:42 -0500
• Cc: xml-dev@l...
• In-reply-to: <001901c1dbdd$7cc4c450$6400a8c0@seairthlaptop>
• References: <3CAB42D4.1030402@d...> <200204031820.TAA14729@m...> <20020403183305.GA16884@p...> <002201c1db41$a2e79e10$6400a8c0@seairthlaptop> <3CAB816E.9326EAAF@r...> <3CAB95F2.31C14211@a...> <3CAC0602.A85204F9@r...> <001901c1dbdd$7cc4c450$6400a8c0@seairthlaptop>
• User-agent: Mutt/1.3.25i

On Thu, Apr 04, 2002 at 08:34:46AM -0500, Seairth Jacobs wrote:
> One of the things I undersand to be true about XML-1.0 is that it is a
> subset of SGML such that any SGML processor can understand and XML document
> as-is.  If XML Nnamespaces-1.1 were to be joined to XML-1.1, what does this
> mean about SGML compatibility?  Is this even a consideration for future
> versions of XML?  Or is the issue of compatibility only concerned with
> well-formedness? (sorry, I know little about SGML itself.)

In general, namespaces and DTDs do not play very well together.  But 
in a restricted sense, they can be made to cooperate.

See SVG for an example of an XML vocabulary that uses DTDs and
namespaces.  It's not a generalized application of namespaces+DTDs, 
but it does show that the two technologies *can* be interoperable to
a limited degree.  I'd be very surprised if an SVG document cannot
be validated by an SGML parser.

Over the last 5 years, SGML compatibility has been a significant
issue to a small minority of XML users.  Those who still require
it will continue to have interoperability with XML 1.0 and SGML,
even if (when?) XML 1.0+epsilon breaks SGML compatibility.

That's a fair trade.

Z.

• References:
  • Re: WD for Namespaces 1.1
    • From: Eric van der Vlist <vdv@d...>
  • Re: WD for Namespaces 1.1
    • From: Richard Tobin <richard@c...>
  • Re: WD for Namespaces 1.1
    • From: Adam Turoff <ziggy@p...>
  • Re: WD for Namespaces 1.1
    • From: "Seairth Jacobs" <seairth@s...>
  • Re: WD for Namespaces 1.1
    • From: Ronald Bourret <rpbourret@r...>
  • Re: WD for Namespaces 1.1
    • From: Marcus Carr <mcarr@a...>
  • Re: WD for Namespaces 1.1
    • From: Ronald Bourret <rpbourret@r...>
  • XML compatibility with SGML (was Re: WD for Namespaces 1.1)
    • From: "Seairth Jacobs" <seairth@s...>

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