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RE: [xml-dev] Restrictions on existence of attributes?
- To: "Robin Berjon" <robin.berjon@...>,"Rick Jelliffe" <rjelliffe@...>
- Subject: RE: [xml-dev] Restrictions on existence of attributes?
- From: "Chiusano Joseph" <chiusano_joseph@...>
- Date: Tue, 27 Jun 2006 09:51:22 -0400
- Cc: "Howard Bartel" <hbartel@...>,<xml-dev@...>
- Thread-index: AcaZ2QJd+FhZKazmT8aGCe6gvRojxAAF7F5Q
- Thread-topic: [xml-dev] Restrictions on existence of attributes?
Perhaps a reference to an attribute group, with a minOccurs and maxOccurs of 1?
Joe
Joseph Chiusano
Associate
Booz Allen Hamilton
700 13th St. NW, Suite 1100
Washington, DC 20005
O: 202-508-6514
C: 202-251-0731
Visit us online@ http://www.boozallen.com
-----Original Message-----
From: Robin Berjon [mailto:robin.berjon@...]
Sent: Tuesday, June 27, 2006 6:59 AM
To: Rick Jelliffe
Cc: Howard Bartel; xml-dev@... Developers
Subject: Re: [xml-dev] Restrictions on existence of attributes?
> Howard Bartel wrote:
>> On Jun 27, 2006, at 07:57, Rick Jelliffe wrote:
>> How do I specify that an element MUST have ONLY ONE of a set of
>> possible attributes?
>> I understand that there is a "choice" option but it seems that this
>> only applies to elements, not attributes within an element.
> If you are using XML Schemas, then look at the "enumeration"
> "facet" of "datatypes". Your element must be a "complex type".
I don't think that'll solve Howard's problem since he wants only one of a set of attributes, not only one of a set of attribute values.
Presumably this can always be remodelled with some indirection (e.g.
having a @name attribute which is an enumeration, and an @value which would give its value), but that might not be an option.
My XML Schema is getting very rusty since I don't get to use it much anymore, but I don't think it can be done (or if it can it involves dark magic). In RelaxNG it's just a <choice> of <attribute> elements, easy as &pgr;.
--
Robin Berjon
Senior Research Scientist
Expway, http://expway.com/
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