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RE: XML Schema Question

• To: "'Bullard, Claude L \(Len\)'" <clbullar@i...>,<xml-dev@l...>
• Subject: RE: XML Schema Question
• From: "Priscilla Walmsley" <priscilla@w...>
• Date: Tue, 25 Nov 2003 07:56:20 -0500
• In-reply-to: <15725CF6AFE2F34DB8A5B4770B7334EE03F9EF92@h...>
• Organization: Datypic, Inc.
• Thread-index: AcOyyRGabh7JjBLkTli5L6EHcbEKpQAiSHIQ

Hi Len,

Normally, min/maxOccurs are allowed on the choice element.  Those 2 choice
groups are invalid because they each appear as the child of a "group"
element.  XML Schema does not allow min/maxOccurs on the children of
"group".  Instead, you put min/maxOccurs on the _reference_ to the group, as
in: 

<group ref="xxx" minOccurs="0" maxOccurs="6"/>

Hope that helps,
Priscilla

-----------------------------------------------------
Priscilla Walmsley             priscilla@w...
Author, Definitive XML Schema     (Prentice Hall PTR)
-----------------------------------------------------  

> -----Original Message-----
> From: Bullard, Claude L (Len) [mailto:clbullar@i...] 
> Sent: Monday, November 24, 2003 3:23 PM
> To: xml-dev@l...
> Subject:  XML Schema Question
> 
> A work item.  I am looking into some issues 
> with the X3D draft XML Schema.   I am using 
> the W3C online validator.  The definition of 
> the choice element type in the official specification 
> and the Wrox XML Schemas book appear to conflict. 
> Please, would someone confirm or deny the following.
> 
> We are assuming that the W3C validator at
> http://www.w3.org/2001/03/webdata/xsv
> is the gold standard (not quite but really the reference 
> implementation):
> 
> Using that implementation, I get the following:
> 
> http://www.web3d.org/specifications/x3d-3.0.xsd:3200:3: Invalid per
> cvc-complex-type.1.3: undeclared attribute {None}:minOccurs
> 
> http://www.web3d.org/specifications/x3d-3.0.xsd:3221:3: Invalid per
> cvc-complex-type.1.3: undeclared attribute {None}:minOccurs
> 
> http://www.web3d.org/specifications/x3d-3.0.xsd:3221:3: Invalid per
> cvc-complex-type.1.3: undeclared attribute {None}:maxOccurs
> 
> So, http://www.w3.org/TR/xmlschema-1/#normative-schemaSchema
> 
>  <xs:complexType name="simpleExplicitGroup">
>   <xs:complexContent>
>    <xs:restriction base="xs:explicitGroup">
>     <xs:sequence>
>      <xs:element ref="xs:annotation" minOccurs="0"/>
>      <xs:group ref="xs:nestedParticle" minOccurs="0" 
> maxOccurs="unbounded"/>
>     </xs:sequence>
>     <xs:attribute name="minOccurs" use="prohibited"/><!-- 
> Can't have one -->
>     <xs:attribute name="maxOccurs" use="prohibited"/><!-- 
> Can't have one -->
>    </xs:restriction>
>   </xs:complexContent>
>  </xs:complexType>
> 
> so this
> 
> 	<xsd:choice minOccurs="0">
> 		<xsd:element ref="AudioClip"/>
> 		<xsd:element ref="MovieTexture"/>
> 		<xsd:element ref="ProtoInstance"/>
> 	</xsd:choice>
> 
> and this
> 
> 	<xsd:choice minOccurs="0" maxOccurs="6">
> 		<xsd:element ref="ImageTexture"/>
> 		<xsd:element ref="MovieTexture"/>
> 		<xsd:element ref="MultiTexture"/>
> 		<xsd:element ref="PixelTexture"/>
> 		<xsd:element ref="ProtoInstance"/>
> 	</xsd:choice>
> 
> are invalid, yes?
> 
> len
> 
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• References:
  • XML Schema Question
    • From: "Bullard, Claude L (Len)" <clbullar@i...>

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