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   Re: parser for xml-data?

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  • From: "Rick Jelliffe" <ricko@allette.com.au>
  • To: <xml-dev@ic.ac.uk>
  • Date: Sat, 9 May 1998 10:57:43 +1000

From: Ron Bourret <rbourret@dvs1.informatik.tu-darmstadt.de>

> The only major difference I have found so far for XML is that the elements
> XML documents are ordered, while data members in OO programming languages
> not.

There is an error in the (January 5?) XML-data report, in the very first
It gives the clear impression that XML-data does not constrain sequence for
the element types it describes. In the example, the declarations for the
types which can appear as the content of an element types are given in one
order, but the instance has them in another order.  (A Microsoft
pointed this out to me: I dont know why they haven't just reissued the note,
since it
is a fairly cricitical point for implementors.)

Also note that the usage of ISO 8601 date formats seems to be wrong.
ISO 8601 date format is yyyy-mm-dd, e.g. 1998-05-09, and not 19980509,
last time I looked.

If anyone is thinking of implementing XML-data, I suggest they befriend the
authors, because the report misses out on several key issues. (I have
mentioned that is does not seem to make clear whether you can have an
XML-data schema as part of a document, or whether it must be external. If it
is internal, can it describe the document's root element? I suppose a close
reading of the XML-data text might help, but it is not clear to me after
dozens of readings, but I do not claim to be particularly brilliant in this

Rick Jelliffe

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