- From: G. Ken Holman <gkholman@CraneSoftwrights.com>
- Date: Sat, 16 Feb 2002 11:29:19 -0500
- To: <xmlschema-dev@w3.org>
At 2002-02-16 08:14 -0500, Steve Baker wrote: >Sorry John: the all in my last post should of course have been a >sequence. IE > ><?xml version = "1.0" encoding = "UTF-8"?> ><xsd:schema xmlns:xsd = "http://www.w3.org/2001/XMLSchema"> > > <xsd:element name='A' type='xsd:anyType'/> > <xsd:element name='B' type='xsd:anyType'/> > > <xsd:element name='seqAB'> > <xsd:complexType> > <xsd:sequence> > <xsd:group ref='seqABgroup' minOccurs='0' maxOccurs='unbounded'/> > <xsd:element ref='A' minOccurs='0'/> > </xsd:sequence> > </xsd:complexType> > </xsd:element> > > <xsd:group name='seqABgroup'> > <xsd:sequence> > <xsd:element ref='A'/> > <xsd:element ref='B'/> > </xsd:sequence> > </xsd:group> > ></xsd:schema> When I try the above with the sequence (A, B, A) as requested by the original poster, the MSV tool complains that it is missing a B. I think this is because of "Schema Component Constraint: Unique Particle Attribution" in that you cannot have "A" selectable both from the group and from the subsequent following standalone element. This is because the validator jumps into the group on the detection of the second "A" and is, therefore, looking for the mandatory following "B". The old DTD ambiguity rule, though I could be mistaken and hope that someone will correct me if that is the case. T:\ftemp>type utz3.xml <?xml version="1.0" encoding="iso-8859-1"?> <seqAB> <A/> <B/> <A/> </seqAB> T:\ftemp>msv baker.xsd utz3.xml start parsing a grammar. warnings are found. use -warning switch to see all warnings. validating utz3.xml Error at line:6, column:9 of file:/T:/ftemp/utz3.xml uncompleted content model. expecting: <B> the document is NOT valid. T:\ftemp> (The warning above has to do with the anyType) I still haven't worked it out for myself, but I've run out of time today to look at it. But I think the solution proposed is incomplete. My gut feel is that due to the ambiguity rule that this cannot be done in XSD, but I haven't proven that to myself yet. I hope to look at it later. I hope this helps. ....................... Ken -- Upcoming: 3-days XSLT/XPath and/or 2-days XSLFO - Feb 18-22, 2002 G. Ken Holman mailto:gkholman@CraneSoftwrights.com Crane Softwrights Ltd. http://www.CraneSoftwrights.com/x/ Box 266, Kars, Ontario CANADA K0A-2E0 +1(613)489-0999 (Fax:-0995) ISBN 0-13-065196-6 Definitive XSLT & XPath ISBN 1-894049-08-X Practical Transformation Using XSLT and XPath ISBN 1-894049-07-1 Practical Formatting Using XSLFO XSL/XML/DSSSL/SGML/OmniMark services, books(electronic, printed), articles, training(instructor-live,Internet-live,web/CD,licensed) Next public training: 2002-02-18,21,27,03-04,05,06,11,15, - 04-08,09,10,11,05-06,07,09,10,06-04,07,10,11,13,14
Received on Saturday, 16 February 2002 11:29:29 UTC