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At 2003-12-17 08:38 -0600, Bullard, Claude L (Len) wrote:
>Two only slightly related questions:
>
>1. Why did XML keep the requirement for deterministic models?
XML DTDs kept deterministic models, probably because of compatibility with
SGML ... XML markup doesn't have a requirement for deterministic models ...
I sure like that RELAX-NG doesn't require this.
Actually, it even says why for DTDs explicitly in the spec:
http://www.w3.org/TR/REC-xml#determinism
>2. What are good reasons for having multiple schemas for the same
> instance?
Document life-cycle ... at different stages of a document's life there may
be different sets of validation requirements.
Document audience ... what one person needs might be poison to another.
Document processing ... one can short-circuit coding in a program by
delegating certain tasks to validation.
Probably lots of others as well ....... keeping any reference to a document
model out of the document itself is, in my opinion, a Good Thing.
In summary: how one looks at a document should be up to the recipient, I
think, more so than the sender.
I hope this helps.
............... Ken
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