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Re: Why doesn't XML have Bag?

• From: "Roger L. Costello" <costello@m...>
• To: xml-dev@i...
• Date: Fri, 26 Mar 1999 08:32:53 -0500

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@m...]
> >
> > 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.
> --
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• Follow-Ups:
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    • From: Paul Prescod <paul@p...>
  • Re: Why doesn't XML have Bag?
    • From: Lars Marius Garshol <larsga@i...>
  • Re: Why doesn't XML have Bag?
    • From: Andrew McNaughton <andrew@s...>

• References:
  • RE: Why doesn't XML have Bag?
    • From: "Matthew Sergeant (EML)" <Matthew.Sergeant@e...>

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