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   Re: element order restrictions?

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  • From: Robin LaFontaine <robin@monsell.co.uk>
  • To: ht@cogsci.ed.ac.uk (Henry S. Thompson), glen.albert@autodesk.com
  • Date: Mon, 10 Jul 2000 15:10:52 +0100


A related question: is it possible in XML Schema to distinguish 
between the case where the order of the element instances is 
important (significant) and where it is not?

For example, clearly for a list of points denoting a shape, the order 
of the points is important. But for a set of points representing 
possible target positions, the order is not important.

Another example: in XML Schema the definition of the elements in a 
choice can be given in any order, but in a sequence the order is 

This distinction is very important in many data files and it would be 
good to be able to indicate this in an XML Schema, but I do not think 
it is possible.


At 11:22 am +0100 10/7/00, Henry S. Thompson wrote:
>If I understand your design correctly, what you need is
>   <element name="CoordGeom">
>           <complexType>
>             <choice minOccurs="0" maxOccurs="unbounded>
>                 <element ref="Line"/>
>                 <element ref="Curve"/>
>                 <element ref="Spiral"/>
>             </choice>
>           </complexType>
>   </element>
>  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
>          W3C Fellow 1999--2001, part-time member of W3C Team
>     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
>	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
>		     URL: http://www.ltg.ed.ac.uk/~ht/
>This is xml-dev, the mailing list for XML developers.
>To unsubscribe, mailto:majordomo@xml.org&BODY=unsubscribe%20xml-dev
>List archives are available at http://xml.org/archives/xml-dev/

-- -----------------------------------------------------------------
Robin La Fontaine, Monsell EDM Ltd
(R&D Project Management, Engineering Data Exchange using XML, EDIF)
Tel: +44 1684 592 144 Fax: +44 1684 594 504 or +44 870 054 2811
Email: robin@monsell.co.uk       http://www.monsell.co.uk

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