OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.


Help: OASIS Mailing Lists Help | MarkMail Help



   Re: Why doesn't XML have Bag?

[ Lists Home | Date Index | Thread Index ]
  • From: Paul Janssens <paul.janssens@skynet.be>
  • To: xml-dev@ic.ac.uk
  • Date: Fri, 26 Mar 1999 19:14:51 +0100

Frank Boumphrey wrote:
> In SGML you can put
> (a&b&c) whicch means that eachelement must appear only once but in any
> order.
> My understanding was that it was ommited because of the requirement
> "XML software shall be easy to write"
> It takes only a few lines of C code to validate the second requirement but a
> LOT more to validate the first.

How about expanding it as you parse the DTD (bottom-up coding)

node ampersand(node a node b) {
   return or(concat(a,b),concat(clone(b),clone(a)));

that's just adding three lines to your code.

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@ic.ac.uk
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1
To (un)subscribe, mailto:majordomo@ic.ac.uk the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo@ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)


News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 2001 XML.org. This site is hosted by OASIS