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   Re: Check out the DCD submission

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  • From: Peter Murray-Rust <peter@ursus.demon.co.uk>
  • To: xml-dev@ic.ac.uk
  • Date: Tue, 11 Aug 1998 09:21:50

At 16:20 10/08/98 -0700, Tim Bray wrote:
>There's a new IBM/Microsoft submission at 
>  http://www.w3.org/Submission

I assume this is the same document as at:


My comments are directed to the latter.

> fashion as traditional XML DTDs. DCD also provides additional properties, 
> such as basic datatypes. 

I am primarily concerned with the basic datatypes section 4. I want to use
these (or something like them) in CML, healthcare and so on. I shall
extract this subset of the document and re-use the concepts in JUMBO2.
(Having spent many years weaning myself off FORTRAN, I'm not very excited
by section 4.3 (COBOL pictures) and shan't implement them, but I assume
they meet mainstream database longings. They look awfully like bolting
presentation/formatting into XML which we are told is a Bad Thing.
Shouldn't this be a stylesheet issue?)

I note that max and min have changed from being content to attributes. I
just re-tooled to be XML-data-compatible (<min> and <max> as children of
the element. I used to write my variables like:
<Item min="1.2" max="2.3" title="density" units="Mg m-3">1.8</Item>
but found that things like units were too rich to be a simple attribute. So
I moved, XML-data-like, to having them all as children. I am not convinced
they should be attributes.
		they are defaulted in the schema
		they don't appear in the tree
		they can't (easily) be tailored for each instance because they don't
occur in the document (unless I have the schema mechanism wrong)
		they can't be qualified (e.g. 
<min helpRef="some-ISO-doc.xml">1.2</min>
>I have lots of opinions about it, which can wait for Montreal now. -Tim

	We'd be delighted if you feel inspired to answer any queries before then...


Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic
net connection
VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary

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