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Re: minOccurs=maxOccurs=0

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: Sat, 06 Sep 2003 11:20:16 +0100
To: marktt@excite.com
Cc: xmlschema-dev@w3.org
Message-ID: <f5b3cfauskf.fsf@erasmus.inf.ed.ac.uk>

"Mark Thomson" <marktt@excite.com> writes:

> I am sorry if this question has been asked before. The XML Schema 
> (structures) doc says (at least) in  section 3.3.2 (XML Representation 
> of Element Declaration Schema Components):
>
> unless minOccurs=maxOccurs=0, in which case the item corresponds to no 
> component at all

That's the maxOccurs and minOccurs _attributes_ in the XML of a schema
_document_.

> Section (or subsection) 3.9.6 (Constraints on Particle Schema  
> Components) says that if maxOccurs != unbouded, then maxOccurs must be 
> greater than or equal to 1. Doesn't this contradict the above ? 

You haven't copied this carefully -- it actually says

  "If {max occurs} is not unbounded . . . then . . .
   {max occurs} must be greater than or equal to 1."

This is about _properties_ of _components_.  There is no
contradiction, indeed the two statements are self-reinforcing:  the
first says a particular kind of representation does not map to a
component, and the second rules out the kind of component it would
otherwise have mapped to.

Hope this helps,

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@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
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Received on Saturday, 6 September 2003 06:20:18 GMT

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