W3C home > Mailing lists > Public > xmlschema-dev@w3.org > September 2003

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

  ( 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?) )


   <xs:element ref="CommentWorkGrid"/>
    <xs:element ref="IndicationDaysAndHours" minOccurs="28" maxOccurs="28"/>
    <xs:element ref="CommentWorkGrid" minOccurs="0">

it will be OK.

  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/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
Received on Monday, 15 September 2003 11:49:01 UTC

This archive was generated by hypermail 2.3.1 : Wednesday, 7 January 2015 14:56:03 UTC