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Re: xs:key and nesting

From: George Cristian Bina <george@oxygenxml.com>
Date: Thu, 16 Feb 2006 11:50:40 +0200
Message-ID: <43F44AF0.1020704@oxygenxml.com>
To: richard.liu@ubs.com
Cc: xmlschema-dev@w3.org

Hi Richard,

This looks to me like a bug in Xerces 2.7.1.
I will check that against the current Xerces SVN snapshot to see if it 
shows the same problem and let you know.

Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com


richard.liu@ubs.com wrote:
> I have the following schema:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
>     targetNamespace="http://www.ubs.com/namespace/wbml-render"
>     xmlns:wbr="http://www.ubs.com/namespace/wbml-render"
>     xmlns="http://www.ubs.com/namespace/wbml-render"
> elementFormDefault="qualified"
>     attributeFormDefault="unqualified">
>     <xs:complexType name="footnoteExplanation">
>         <xs:annotation>
>             <xs:documentation>The text explaining the
> footnote.</xs:documentation>
>         </xs:annotation>
>         <xs:simpleContent>
>             <xs:extension base="xs:string"/>
>         </xs:simpleContent>
>     </xs:complexType>
>     <xs:complexType name="footnote">
>         <xs:annotation>
>             <xs:documentation>Composed of base and
> explanation.</xs:documentation>
>         </xs:annotation>
>         <xs:sequence>
>             <xs:element name="footnoteBase" type="footnoteBase"/>
>             <xs:element name="footnoteExplanation"
> type="footnoteExplanation" minOccurs="0"/>
>         </xs:sequence>
>         <xs:attribute name="footnoteId" type="xs:NMTOKEN"
> use="optional"/>
>         <xs:attribute name="footnoteRef" type="xs:NMTOKEN"
> use="optional"/>
>     </xs:complexType>
>     <xs:complexType name="footnoteBase" mixed="true">
>         <xs:annotation>
>             <xs:documentation>The text to which the footnote
> pertains.</xs:documentation>
>         </xs:annotation>
>         <xs:sequence>
>             <xs:element ref="footnote" minOccurs="0"
> maxOccurs="unbounded"/>
>         </xs:sequence>       
>     </xs:complexType>
>     <xs:element name="footnote" type="footnote">
>         <!--<xs:key name="ref_or_explanation">
>             <xs:selector xpath="."/>
>             <xs:field xpath="wbr:footnoteExplanation | @footnoteRef"/>
>         </xs:key>-->
>     </xs:element>
>     <xs:element name="para">
>         <xs:complexType mixed="true">
>             <xs:sequence>
>                 <xs:element ref="footnote" minOccurs="0"
> maxOccurs="unbounded"/>
>             </xs:sequence>
>         </xs:complexType>
>         <xs:key name="ref_or_explanation">
>             <xs:selector xpath=".//wbr:footnote"/>
>             <xs:field xpath="wbr:footnoteExplanation | @footnoteRef"/>
>         </xs:key>
>     </xs:element>
> </xs:schema>
> 
> and the following XML schema instance
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <wbr:para xmlns:wbr="http://www.ubs.com/namespace/wbml-render"
>     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>     xsi:schemaLocation="http://www.ubs.com/namespace/wbml-render
>  
> file:/Users/richard/Documents/Work/Accessibility/Schemas/test_footnote.x
> sd"> Now is 
>     <wbr:footnote footnoteRef="abc">
>         <wbr:footnoteBase>the</wbr:footnoteBase>
>         <!--<wbr:footnoteExplanation>As Clinton said, "It depends on
> what you mean by 'the'."</wbr:footnoteExplanation>-->
>     </wbr:footnote> for 
>     <wbr:footnote>
>         <wbr:footnoteBase>
>             <wbr:footnote>
>                 <wbr:footnoteBase>
>                     <wbr:footnote footnoteRef="x22">
>                         <wbr:footnoteBase>all</wbr:footnoteBase>
>                     </wbr:footnote> good
>                 </wbr:footnoteBase>
>                 <wbr:footnoteExplanation>In some inner
> sense.</wbr:footnoteExplanation>
>             </wbr:footnote> men
>         </wbr:footnoteBase>
>         <wbr:footnoteExplanation>Good women,
> too.</wbr:footnoteExplanation>
>     </wbr:footnote>
> </wbr:para>
> 
> The xs:key on the para element is supposed to ensure that each footnote
> descendant has either a footnoteExplanation child or a footnoteRef
> attribute.  The first footnote child of para "works" as desired (in
> Oxygen 7, i.e., Xerces):  Uncommenting the footnoteExplanation element
> results in an error, as does deleting the footnoteRef attribute.
> 
> The second footnote element is rather complicated, because the model
> permits "nesting" footnotes.  The XML seems valid:  The second footnote
> element has a footnoteExplanation and no footnoteRef, so does its first
> footnote descendent, and the innermost footnote has a footnoteRef
> attribute and no footnoteExplanation.
> 
> Nevertheless, I receive the following two error messages (I've pasted
> the offending statement after the Location):
> 
> SystemID:
> /Users/richard/Documents/Work/Accessibility/Schemas/test_footnote.xml
> Location: 18:88
>                 <wbr:footnoteExplanation>In some inner
> sense.</wbr:footnoteExplanation>
> Description: E Identity constraint error:  field
> "./wbr:footnoteExplanation|@footnoteRef" matches more than one value
> within the scope of its selector; fields must match unique values.
> 
> SystemID:
> /Users/richard/Documents/Work/Accessibility/Schemas/test_footnote.xml
> Location: 21:76
>         <wbr:footnoteExplanation>Good women,
> too.</wbr:footnoteExplanation>
> Description: E Identity constraint error:  field
> "./wbr:footnoteExplanation|@footnoteRef" matches more than one value
> within the scope of its selector; fields must match unique values.
> 
> Can anybody tell me what I'm missing?
> 
> Thanks,
> Richard
> 
Received on Thursday, 16 February 2006 09:49:08 GMT

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