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Re: Occurrence constraints

From: ht@---.--.--.-- (----- -. --------)
To: "Xan Gregg" <Xan.Gregg@---.--->
Date: 6/4/2004 11:15:00 AM
The Component Constraint you quote is just that, a constraint on
_components_ in _schemas_, and applies to the {max occurs} and {min
occurs} properties.

The XML Representation used in schema _documents_ allows the
_attributes_ maxOccurs and minOccurs to have value 0, but, as noted in
your other quote, this results in no component.

So e.g.

 <xs:sequence>
  <xs:element name="foo" type="baz" minOccurs="0" maxOccurs="0"/>
  <xs:element name="bar" type="xs:string"/>
 </xs:sequence>

may occur legally in a schema document, but the corresponding sequence
Particle component will contain only one Element Declaration
component.

Sorry for the confusion.

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]

From ht@i...  Fri Jun  4 05:15:26 2004
Return-Path: <ht@in


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