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Re: Schema validation

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: Mon, 15 Sep 2003 16:46:22 +0100
To: Lefèvre@inf.ed.ac.uk, Marc <Marc.Lefevre@softwareag.com>
Cc: "'xmlschema-dev@w3.org'" <xmlschema-dev@w3.org>, "'xml-dev@lists.xml.org'" <xml-dev@lists.xml.org>
Message-ID: <f5bznh6t5pt.fsf@erasmus.inf.ed.ac.uk>

Your schema includes a content model similar to the following in
DTD-notation:

  ( IDAH+ | CWG | ( IDAH+ , CWG) )

This is not allowed, by XML 1.0 in a DTD, and by W3C XML Schema in a
schema, because given an IDAH element in an instance, a processor
cannot immediately determine whether the first or the third branch of
the above choice is to be followed.

If you rewrite the above as

  ( CWG | ( IDAH+ , CWG?) )

or

  <xs:choice>
   <xs:element ref="CommentWorkGrid"/>
   <xs:sequence>
    <xs:element ref="IndicationDaysAndHours" minOccurs="28" maxOccurs="28"/>
    <xs:element ref="CommentWorkGrid" minOccurs="0">
     <xs:annotation>
       <xs:documentation>90037</xs:documentation>
     </xs:annotation>
    </xs:element>
   </xs:sequence>
 </xs:choice>

it will be OK.

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 Monday, 15 September 2003 11:49:01 GMT

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