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Re: Again wit da AND and Repetitions

  • From: terje@i... (Terje Norderhaug)
  • To: xml-dev@i...
  • Date: Sat, 15 May 1999 13:21:36 -0700

Re: Again wit da AND and Repetitions
At 5:11 PM 5/14/99, roddey@u... wrote:
>>>Does anyone believe that these can be done in less than brute force tree
>>XML requires deterministic content models. This allows validators to do
>>their job without having to look more than one element ahead or do brute
>>force tree searches.
>Actually it does not require deterministic models, it just allows you to check
>for them. And, I guess its not really what XML does or does not do that's in
>question here, its what the new upcoming schema spec proposes to do that's at

The XML 1.0 specification, 3.2.1 states that:

"For compatability, it is an error if an element in the document can match
more than one occurance of an element type in the content model".

See also Appendix E to the specification, which describes in further detail
what is meant by a deterministic and ambigous content model.

It follows from the definition that a validating XML parser doesn't have to
look ahead. This is important as it simplifies implementing validation.

-- Terje <Terje@i...> | Media Design in*Progress

   Software for Mac Web Professionals at <http://www.in-progress.com>
   Take advantage of XML with Emile, the first XML editor for Mac.

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