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   RE: What are schemata

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  • From: Tim Bray <tbray@textuality.com>
  • To: xml-dev@ic.ac.uk
  • Date: Sun, 31 May 1998 13:00:55 -0700

>> | So is a schema a function that maps a document to a truth value?
>> I'd rather say that it is a definition of a set of documents, just as
>> a formal language is usually considered to be the set of sentences
>> that are well-formed in that language.

Hmm, this line of thought may be perpetuating what I see as one of
the shortcomings of DTDs, namely that the DTD has to describe the
whole document, i.e. a class of languages.  What about partial
validation/constraints?  I think it's important that child-of-DTD
support compond documents & partial validation.  So in the terms above,
maybe these things define sets of elements and attributes, rather
than whole documents. -Tim

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