Why doesn't XML have Bag?
Roger L. Costello
costello at mitre.org
Fri Mar 26 13:36:13 GMT 1999
Matt,
Then let me ask another question - why do DTDs not allow me to specify
an unordered list of elements? For example,
<!ELEMENT Kitchen RDF:Bag(Sink, Stove, Refrigerator)>
With this notation I am trying to indicate that an XML document that
conforms to this DTD must have a <Kitchen> element which has three child
elements - <Sink>, <Stove>, and <Refrigerator>, and these child elements
can be in any order. Isn't this a useful thing? I have had a number of
times where I wish that I could do this.
I gather from your message that you are saying that it is not a
limitation of XML, but rather a limitation of DTDs? How about DCDs?
Thanks. /Roger
Matthew Sergeant (EML) wrote:
>
> > -----Original Message-----
> > From: Roger L. Costello [SMTP:costello at mitre.org]
> >
> > Why doesn't XML support the notion of an unordered list of elements,
> > i.e., a Bag? Perhaps this is a limitation of DTD, not XML? That is,
> > DTDs do not support Bags, but XML has no such inherent limitation? Does
> > DCD support Bags? /Roger
> >
> Unordered list in XML:
>
> <ul>
> <li>An Item</li>
> <li>Another Item</li>
> </ul>
>
> Ordered list in XML:
>
> <ol>
> <li>Item 1</li>
> <li>Item 2</li>
> </ol>
>
> The point is an unordered list is an application level issue, not an
> XML level issue - it's easy to implement one at your application level. Nay
> - I would go as far as to say it's trivial.
>
> Matt.
> --
> http://come.to/fastnet
> Perl on Win32, PerlScript, ASP, Database, XML
> GCS(GAT) d+ s:+ a-- C++ UL++>UL+++$ P++++$ E- W+++ N++ w--@$ O- M-- !V
> !PS !PE Y+ PGP- t+ 5 R tv+ X++ b+ DI++ D G-- e++ h--->z+++ R+++
xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev at 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 at ic.ac.uk the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo at ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa at ic.ac.uk)
More information about the Xml-dev
mailing list