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NSXMLDocument and XSD substitutionGroup

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NSXMLDocument and XSD substitutionGroup

Subject: NSXMLDocument and XSD substitutionGroup
From: Thomas Castiglione <email@hidden>
Date: Tue, 17 Jun 2008 12:02:30 +0800

Hi all,

I've been trying to use NSXMLDocument to validate stuff with an XML Schema rather than a DTD, and have run into a problem. It doesn't seem to be correctly implementing the substitutionGroup 'polymorphism' aspect of XSD. The pattern goes like this:

-- in schema
 <xs:element name="base" type="xs:string"/>
 <xs:element name="firstSubtype" substitutionGroup="base"/>
 <xs:element name="secondSubtype" substitutionGroup="base"/>

 <xs:element name="container">
   <xs:complexType>
     <xs:sequence>
       <xs:element minOccurs="0" maxOccurs="unbounded" ref="base"/>
     </xs:sequence>
   </xs:complexType>
 </xs:element>

-- in XML document <container> <base>Node of base type - this works</base> <firstSubtype>Node of substituted type - this does not work</ firstSubtype> </container>

If I have that firstSubtype element in there, NSXMLDocument init/ validation returns the error "Element 'container' [CT local]: The element content is not valid."

Is this a bug/limitation of NSXML, or am I doing something wrong?

Thanks,
Thomas Castiglione
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