[dsdl-discuss] Re: Is SGML in scope for DSDL?

From: "Martin Bryan" <mtbryan@sgml.u-net.com>

> a) We are required by our charter from SC34 to come up with a mechanism that
> will allow the validation of SGML documents as well as XML documents

No problem with that.

> b) Restricting ourself to XML 1.n features is not feasible as we have
> already identitifed features DSDL needs that XML 1.n will not define. In
> addition, we will need to be able to conform to XML 2.n, 3.n, etc, so
> writing a restriction to conform to XML 1.n into the spec will be a serious
> inhibition to the long term use of DSDL

Which are these?

> c) Restricting ourselves to the XML Infoset is also irrational when we are
> going to provide information that is not currently included in the Infoset
> (e.g. characters subset info). Certainly we should ensure that all of the
> Infoset if covered, but to restrict ourselves to this minimalist approach is
> just not acceptable

I don't understand this. The character subset is a constraint against which
we test documents (and or schemas) surely?

> d) We have agreed that we need to be able to make the extensions such as
> datatypes and cardinality available to those using DTDs in preference to
> schemas (the vast majority of current users). If we extend DTDs then the
> extensions should be designed to work with SGML DTDs as well as with the
> subset of SGML DTDs adopted for XML 1.0

I thought we had no editor for that. I think I sent around a note showing that
there could be a binding of XML Schemas using SGML DTDs, that could be
the basis of such a thing. But I really think this is an 80/20 issue for SGML:
it would be enough merely to show how datatyping can be done using
the DATA keyword on declarations, and show how to reference other specs
in a RELAX NG-like fashion.

Cheers
Rick Jelliffe

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