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   Re: Document Feature Requirements [was: Common XML ...]

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  • From: "Michael Champion" <Mike.Champion@softwareag-usa.com>
  • To: "XML-Dev Mailing list" <xml-dev@xml.org>
  • Date: Sat, 8 Apr 2000 09:41:49 -0400

----- Original Message -----
From: "Steven Rowe" <sarowe@textwise.com>
To: "Simon St.Laurent" <simonstl@simonstl.com>
Cc: "XML-Dev Mailing list" <xml-dev@xml.org>
Sent: Saturday, April 08, 2000 1:09 AM
Subject: Document Feature Requirements [was: Common XML ...]

> Is it not ironic that Common XML, an attempt to increase interoperability,
> excludes PIs, which are likely to be the mechanism which will be proposed
> to express document feature requirements, another attempt to increase
> interoperability.

To be pedantic, specifying that everyone should understand a small set of
objects encoded in PI syntax (the XFM along with the stylesheet binding and
the XML declaration that's not REALLY a PI) is a far cry from recommending
that one can safely use PI's willy-nilly.

Nevertheless, the irony has not been lost on the SML-DEV list!  Actually,
the very reasons that PIs are excluded from the current draft of Common XML
is very apropos to the discussion of their potential use in the Feature

1 - the W3C discourages them
2 - Many products don't round-trip them
3 - There is no generally used mechanism signifying how they are used

But they *are* good for quick hacks that a user community could agree on,
since most modern tools will more or less handle them gracefully, and a
PI-based solution would not require DTD/schema changes. In the long run we
need a clean solution, but if XML-DEV can come up with a set of conventions
that producers and consumers of XML can agree to informally support, we can
quickly address the problems that Peter Murray-Rust has raised.

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