XML trade off 1 - DTD vs XML Schema

Edd Dumbill edd at usefulinc.com
Mon Jul 26 11:42:00 BST 1999

On Sun, Jul 25, 1999 at 06:16:17PM +0800, Rick Jelliffe wrote:
>  From: Don Park <donpark at quake.net>
> >It is my view that the XML Schema will win over after six months to a
> year
> >of further confusion over schema format and continued maturation of the
> W3C
> >XML Schema spec.  Uncertainty in the dynamics of change in this area
> seems
> >rather low, at least to me.
> [... deletia ...]
> This size difference alone means that XML Schemas will often be used in
> different circumstances to DTDs: the tradeoffs are different.  XML
> Schemas cannot "win" because they run in a different race to DTDs.
> Rick Jelliffe

I agree.  It seems to me that each will get used where considered
pragmatic.  From my point of view, I'd be likely to continue to use
DTDs for "document" applications, whereas I'd use schemas for "data"/
application interaction scenarios, where the added tightness is much
needed, and will enable better tool support.

DTDs can be built by hand, but it looks like tool support will be needed
to build complex Schemas.

Edd Dumbill | Director, Useful Information Co. & Pharmalicensing Ltd
tel: +44 (0) 702-093-6870 | edd at usefulinc.com | http://usefulinc.com
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