Surely adding a pointless sequence to the choice can't affect the =
outcome,
because a pointless sequence is ignored? But I'm not sure at what point =
in
the algorithm pointless particles are supposed to be discarded.

Anyway, this seems to be one of the cases where the algorithm in Schema =
Part
1 is plain wrong.

Michael Kay 
http://www.saxonica.com/


> -----Original Message-----
> From: xmlschema-dev-request@w... 
> [mailto:xmlschema-dev-request@w...] On Behalf Of George 
> Cristian Bina
> Sent: 13 February 2006 09:34
> To: richard.liu@u...
> Cc: xmlschema-dev@w...
> Subject: Re: E rcase-RecurseLax.1: Group's occurrence range, 
> (1,unbounded), is not a valid restriction of base group's 
> occurrence range, (1,1).
> 
> 
> Hello Richard,
> 
> Xerces is right to report that error as I read the spec. To have this 
> correct you need to add an empty sequence as below:
> <xs:choice>
>    <xs:group ref="a-Group" maxOccurs="unbounded"/>
>    <xs:sequence/>
> </xs:choice>
> Otherwise the main choice particle is ignored according to
> http://www.w3.org/TR/xmlschema-1/#cos-particle-restrict
> See 2, 2.2, 2.2.2, 2.2.2.2.1.
> ***
> 2.2 Any pointless occurrences of <sequence>, <choice> or <all> are 
> ignored, where pointlessness is understood as follows:
> <choice>
> One of the following must be true:
> 2.2.2 All of the following must be true:
> 2.2.2.1 The particle within which this <choice> appears has 
> {max occurs} 
> and {min occurs} of 1.
> 2.2.2.2 One of the following must be true:
> 2.2.2.2.1 The <choice>'s {particles} has only one member.
> ***
> 
> and the restricted type is equivalent with only
> <xs:group ref="a-Group" maxOccurs="unbounded"/>
> 
> that is equivalent with
> 
> <xs:choice maxOccurs="unbounded">
>    <xs:element ref="a1"/>
>    <xs:element ref="a2"/>
>    <xs:element ref="a3"/>
> </xs:choice>
> 
> and this cannot restrict
> 
> <xs:choice>
>    <xs:group ref="a-Group" maxOccurs="unbounded"/>
>    <xs:element ref="b"/>
> </xs:choice>
> 
> as the choice here has minOccurs and maxOccurs equal with 1.
> 
> Best Regards,
> George
> ---------------------------------------------------------------------
> George Cristian Bina
> <oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
> www.---.com
> 
> 
> richard.liu@u... wrote:
> > I have the following W3C XML schema:
> > 
> > <?xml version="1.0" encoding="UTF-8"?>
> > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"  
> > elementFormDefault="qualified" =
targetNamespace="http://www.ubs.com/
> > namespace/wbml-render" xmlns="http://www.ubs.com/namespace/wbml-
> > render" xmlns:wbr="http://www.ubs.com/namespace/wbml-render">
> >      <xs:element name="a" type="xs:string"/>
> >      <xs:element name="a1" type="xs:string"/>
> >      <xs:element name="a2" type="xs:string"/>
> >      <xs:element name="a3" type="xs:string"/>
> >      <xs:element name="b" type="xs:integer"/>
> >      <xs:group name="a-Group">
> >          <xs:choice>
> >              <xs:element ref="a1"/>
> >              <xs:element ref="a2"/>
> >              <xs:element ref="a3"/>
> >          </xs:choice>
> >      </xs:group>
> >      <xs:complexType name="groupBaseType">
> >          <xs:choice>
> >              <xs:group ref="a-Group" maxOccurs="unbounded"/>
> >              <xs:element ref="b"/>
> >          </xs:choice>
> >      </xs:complexType>
> >      <xs:complexType name="groupRestrictedType">
> >          <xs:complexContent>
> >              <xs:restriction base="groupBaseType">
> >                  <xs:choice>
> >                      <xs:group ref="a-Group" =
maxOccurs="unbounded"/>
> >                  </xs:choice>
> >              </xs:restriction>
> >          </xs:complexContent>
> >      </xs:complexType>
> >      <xs:complexType name="baseType">
> >          <xs:choice>
> >              <xs:element ref="a" maxOccurs="unbounded"/>
> >              <xs:element ref="b"/>
> >          </xs:choice>
> >      </xs:complexType>
> >      <xs:complexType name="restrictedType">
> >          <xs:complexContent>
> >              <xs:restriction base="baseType">
> >                  <xs:choice>
> >                      <xs:element ref="a" maxOccurs="unbounded"/>
> >                  </xs:choice>
> >              </xs:restriction>
> >          </xs:complexContent>
> >      </xs:complexType>
> > </xs:schema>
> > 
> > The a-Group is a choice of three elements.  The 
> groupBaseType is a choice of either one to unbounded many 
> instances of a-Group, or of the element b.  I want to define 
> another complex type as a restriction of the groupBaseType.  
> It should not allow b.
> > 
> > In Oxygen 7 I receive the following two error messages.
> > 
> > SystemID: /Applications/oxygen/Untitled1.xsd
> > Location: 21:48
> > Description: E rcase-RecurseLax.1: Group's occurrence 
> range, (1,unbounded), is not a valid restriction of base 
> group's occurrence range, (1,1).
> > URL: http://www.w3.org/TR/xmlschema-1/#rcase-RecurseLax
> > 
> > SystemID: /Applications/oxygen/Untitled1.xsd
> > Location: 21:48
> > Description: E derivation-ok-restriction.5.4.2: Error for 
> type 'groupRestrictedType'.  The particle of the type is not 
> a valid restriction of the particle of the base.
> > URL: http://www.w3.org/TR/xmlschema-1/#derivation-ok-restriction
> > 
> > Evidently, based on the second example using baseType and 
> restrictedType, the error messages pertain to the fact that I 
> am using a group, but I don't understand what is wrong.  Can 
> anybody shed light on the error?
> > 
> > Regards,
> > Richard
> > 
> > Richard R. Liu
> > Gundeldingerstr. 171
> > CH-4053 Basel
> > Switzerland
> > 
> > Tel. +41 (61) 361 3275
> > Email richard.liu@m...
> > 
> > 
> > 
> > Richard R. Liu
> > UBS AG
> > VZA2 - 4.140 IVHS-L2V
> > Postfach
> > CH-8098 Z=FCrich
> > Switzerland
> > 
> > Tel.  +41-44-238 48 82
> > Email richard.liu@u...
> > 
> 
> 



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