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Re: XML schema cos-nonambig problem

• To: Niels Peter Strandberg <nielspeter@n...>
• Subject: Re: XML schema cos-nonambig problem
• From: ht@i... (Henry S. Thompson)
• Date: Fri, 16 Dec 2005 16:25:49 +0000
• Cc: xml-dev@l...
• In-reply-to: <49F83B9F-EB93-459F-8A23-3A73645D4153@n...> (Niels Peter Strandberg's message of "Fri, 16 Dec 2005 16:52:44 +0100")
• References: <49F83B9F-EB93-459F-8A23-3A73645D4153@n...>
• User-agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.17 (linux)

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Niels Peter Strandberg writes:

>       <xs:complexType name="contentiddef">
> 		<xs:choice>
> 			<xs:choice minOccurs="0" maxOccurs="unbounded">
> 				<xs:element ref="x:major"/>
> 				<xs:element ref="x:externalid"/>
> 			</xs:choice>
> 			<xs:choice minOccurs="0" maxOccurs="unbounded">
> 				<xs:element ref="x:major"/>
> 				<xs:element ref="x:minor"/>
> 				<xs:element ref="x:version"/>
> 			</xs:choice>
> 		</xs:choice>
> 	</xs:complexType>

In DTD notation, this is ((ma|e)*|(ma|mi|v)*).

I don't believe this can be made OK, for DTD or W3C XML Schema,
but I also somehow doubt this is what you mean/want, given the names
of the elements involved.

What you have written would allow, for example, any of the following:

  [the empty sequence]
  <minor/> <minor/> <version/> <minor/> <minor/> <major/>
  <major/> <major/>
  <externalId/>

Is that really what you meant?

Here's something that looks more plausible to me, but I may be
guessing completely wrongly:

  (ma,(e|mi,v)?)*

ht
- -- 
 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: ht@i...
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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• References:
  • XML schema cos-nonambig problem
    • From: Niels Peter Strandberg <nielspeter@n...>

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